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Published by Express Publishing
Liberty House, Greenham Business Park, Newbury,
Berkshire RG19 6HW
Tel.: (0044) 1635 817 363
Fax: (0044) 1635817463
e-mail:


© Express Publishing, 2012
Design and Illustration © Express Publishing, 2012
First published 2012
Made in EU
All rights reserved . No part of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form, or by any means, electronic, photocopying, or otherwise, without the prior
written permission of the publishers.
This book is not meant to be changed in any way.
ISBN 978-1-78098-697-5

Book

Answer Key

Unit 1

Unit 2

1 Suggested Answers

1 Suggested Answers

1 A volt is one unit of measurement in electricity.
2 Copper wire is used in electrical wiring because it

1 Televisions, mobile phones, digital cameras, DVD
players, speakers, and computers are examples
of consumer electronics.
2 People can use digital cameras or mobile phones
to take pictures.

2

B

3 1 C
2 G

2 C
3 D
4 E

3 A
5 H
6 A

4 1 A stereo
2 A digital camera
3 A cell phone

7 B
8 F
B camcorder
B speaker
B MP3 player

conducts electricity.

F

2 T

3 F

3 1 H
2 F

3 D

4 E

5 A
6 G

B

2 A

3 B

2

4

5 Suggested Answer
Students will complete a final project at the end of
the class. The project will require them to build their
own electrical circuits.

5 Suggested Answer
A good addition to the stereo is a set of speakers.
This will improve the sound and listening experience.

6

T

2 F

7 1 confused
6

F

2 F

3 F

7 1 I help you
2 stereo
3 speakers

2 resistance
4 on sale
5 shipping costs
6 billing information

8 Suggested Answer

B: Thanks for calling Electronics Superstore. What
can I do for you today?
A: I want to order the Studio 5GK television.
B: Okay, great. Is there anything else you need?
A: I'd also like the Theater DVD player.
B: Those are also part of our sale today.
A: Really? That's terrific! What does it come out to?
B: Your total is $495.99, before taxes and shipping
costs.
A: Great. Let me give you my billing information.

7 B
8 C

3 F
3 current
4 work

5 blockage
6 less

8 Suggested Answer

A: Excuse me, Professor Jones. I was confused by
some of the things you said today.
B: No problem. What were you confused about?
A: Well, can you clarify what you mean by ampere?
B: Sure. It is the unit of measurement of an electric
current.
A: Oh, okay. But what's the difference between
amperes and watts?
B: A watt is the unit of measurement of electric power.
A: OK. I see the difference now.
B: Good.
9 Suggested Answer
Electricity 101
Monday, 8-10

9 Suggested Answer
Electronics Superstore

Customer Survey
What did you purchase? I purchased a television
and a DVD player.
Why did you purchase these items? They were on
sale and I needed to update my electronics.
How did you place your order? I called the toll-free
number.

4

Answer Key

What are some units of measurement for
electricity? An ampere and a watt are some units
of measurement for electricity.
How are they different? An ampere measures
electric current, and a watt measures electric power.
Unit 3

1 Suggested Answers
1 A positive charge is the opposite of a negative
charge.
2 Hertz measures the speed at which current
changes direction.


Book
2 direct current - comes from batteries, moves from
negative to positive
alternating current - switches polarity, moves in two

directions
hertz - measures the speed at which polarity changes
in AC

3 1

C

2 A
4 1

Answer Key

3 F
4 E

5 G
6 B

flathead screwdriver

7 H
8 D

3 magnifier

2 diagonal cutters
5 Suggested Answer

3

D

4 1

2 C

3 E

A Hertz

2 A alternating current
3 A Polarity

4 A

5 B

B Impedance
B Capacitance
B transformer

5 Suggested Answer
A transformer is useful because it can change
alternating current to direct current.

6 1 F

2 T

3 T

There are many important tools used for electronics
repair. Two of the most common tools are a Phillips
screwdriver and needlenose pliers.

F

6

3 T

2 F

7 1 have any tools yet
2 flathead screwdriver
3 Phillips screwdriver

4 Can you recommend
5 rubber handles
6 I really like

8 Suggested Answer
B: Hi, I'm the new apprentice, I'll be working with you.

7 1 relating to
2 understand it
3 type of measurement

4 But what does

5 AC current
6 explain

A: Nice to meet you. Do you have any tools yet?
B: Yes, I have electrical tape already.

A: Good, but you will also need wire strippers.
B: Okay, what's the best brand of wire strippers?
A: I prefer Amos wire strippers.
B: Okay, thanks. Do you recommend anything else?
A: Yes, I really like to use a magnifier when working
with wires. I suggest you get one.

8 Suggested Answer

A: Can I ask you a question about electricity?
B: Sure. What do you want to know?

A: What is capacitance? I don't really get the concept.
B: Well, capacitance is the ability to store a quantity
of electricity in an electric field.
A: What about inductance?
B: That's the ability to store electricity in a magnetic
field.
A: Oh, I see. Thanks.
B: No problem.

9 Suggested Answer
Capacitance: Capacitance is the ability to store an
amount of electricity in an electric field.

Inductance: Inductance is the ability to store electricity
in a magnetic field.

Unit4

Advice from the professional electrician
Electrical tape - already have this
Wire strippers - Amos
Magnifier - good for working with wires

Unit 5
1 Suggested Answers
1 A bench vise can be used to hold things in place.
2 A glue gun or super glue can be used to stick
components to a surface.

T

2 F

3 F

3 1 F

3 E

2 A

4 C

5 G
6 D

2

1 Suggested Answers
1

Flathead screwdrivers, wire strippers, Phillips
screwdrivers, needlenose pliers, hammers, and
diagonal cutters are some tools used when
working on electronics.
2 Wire strippers and diagonal cutters can be used
for cutting wires.

2 1 C

9 Suggested Answer

2 D

3 B

4

super glue

2

7 H

8 B

cooler spray

3 bench vi se

5 Suggested Answer
A stereo microscope can be used to get a very
detailed image.

Answer Key

5


Book
F

6

2 T

Answer Key

3 F

8 Suggested Answer
B: Is everything okay?

7 1 Electric

2 question

3 lifts dirt
4 damages

5 purchase
6 really well

A: No, I've done something wrong. I've melted some
solder in the wrong place.
B: That's okay. Just use a desoldering tool to remove

8 Suggested Answer

it.
A: Oh really? I've never used a desoldering tool.

A: Welcome to Classic City Electric Supply. How
may I help you?
B: Hi, I have a question. What do I use to attach wires?
A: What are you attaching them to?
B: To a component surface.
A: I think you should use a glue gun.
B: What about super glue?
A: With a glue gun, your work will be more accurate.
B: OK. I'll take a glue gun.

B: Well, this is solder wick.
A: How does it work?
B: It's got a copper thread that bonds with the solder

when heated. Let me show you what to do.
A: Thank you very much.

9 Suggested Answer
How to remove solder with solder wick
To remove solder, you can use solder wick. It is
braided with a copper thread that bonds with the
solder when heated.

9 Suggested Answer
Classic City Electric Supply Co.
Customer Feedback Form
What did you purchase? I purchased a glue gun.
Did you get help from an employee? y / N
Was he or she helpful? If so, please explain. The
employee was very helpful. She told me to purchase
a glue gun instead of super glue, as it will make my
work more accurate.
Unit6

1 Soldering irons, solder suckers, and solder wick
are some soldering tools.
2 A solder sucker uses a vacuum pump to remove
old solder.

F

3

bond

2 F

1 Suggested Answers
1

Multimeters, logic analyzers, oscilloscopes, spectrum
analyzers, isolation transformers, and analog
meters are some kinds of testers and meters.
2 A multi meter can measure various different values.

2

1 Suggested Answers

2

Unit 7

3 T
2 components

F

2 T

3 T

3 1 frequency counter
2 isolation transformer

3 analog meter

4 signal generator
5 inductance meter
6 spectrum analyzer

4 1 multimeter
2 transistor tester
3 capacitance meter

4 oscilloscope
5 logic analyzer

3 melt

5 Suggested Answer
4 1 solder, soldering iron
2 solder wick, desoldering iron, solder sucker
3 flux, tip, vacuum pump

Customers requested the company begin carrying
spectrum analyzers and logic analyzers.

6

D

2 B

5 Suggested Answer

It keeps surfaces clean and helps the soldering process.

6

T

2 F

7 1 components
2 solder
3 desoldering

6

Answer Key

3 F
4 sucker
5 vacuum
6 helping me out

7 1 frequency counters
2 running a special
3 total cost

4 for both
5 include shipping
6 free

8 Suggested Answer

A: Hi, this is QMT Readings. My name is Tom. What
can I do for you today?
B: Hi, I work as an electronics tech. My company
needs some additional multimeters.


Book 1 Answer
A: You called at a great time. There's a special offer

B:

A:
B:

A:
B:

on those right now. Multimeters are thirty percent
off.
Awesome. I want six. How much is that?
Each counter is $100. So, it's $600 for six.
Does that price include shipping?
Shipping is free on orders over $300.
That's good to hear.

B: Good idea. Any other suggestions?
A: Yeah, make sure your workplace floor isn't covered
with thick or dark carpet.

9 Suggested Answer
Notes for new workspace
Electrical outlets needed
Modern, grounded electrical service.
Power strip for extra tools.
Other advice
Don't use thick or dark carpet for workplace floor.

9 Suggested Answer
Order Form
Item: multimeter
Price: $100 per item
Quantity: six
Shipping: free on orders over $300

Key

Unit9
1 Suggested Answers
1

Electronics technicians must adjust, modify, inspect,
test, repair, and disassemble.
2 When parts are dirty or greasy they need to be
cleaned.

UnitS
1 Suggested Answers
1

Electronic devices can be worked on using a
workbench.
2 An electrical service is needed to provide electricity
to devices.
C

2 A

3 D

3 1 F
2 C

3 D
4 A

5 G

2

7 B

6 E
3 spot lighting

4 1 sturdy
2 swing arm

2

D

2

A

3 1 removed
2 lifted
3 explained

3 C

4 modified

7 assembled

5 aligned
6 analyzed

5 adjusted

4 1 disassemble
2 inspected
3 cleaned
4 repair

6 recommended

7 calibrated

5 Suggested Answer
5 Suggested Answer

The salary of an electronics technician depends on
the technician's experience. More qualified people
get paid more money.

It is important to have a power strip for a good
works pace because it lets you plug in extra electrical
devices, such as a lamp.

6
6

F

2 T

F

2 T

3 T

3 T

7 1 new workspace
2 do you recommend
3 sturdy and large

4 lighting
5 May I suggest
6 power strips

7 1 experience
2 job duties
3 assembled and tested

4 team player

5 work well
6 candidates

8 Suggested Answer
8 Suggested Answer

A: Hello, how can I help you?
B: I need some items to set up my new workspace.
A: Okay, what sort of work do you do?
B: I repair electronics. I use a lot of electrical tools.
A: Then you need to start with a modern, grounded
electrical service.
B: Okay, thanks. Do I need anything else?
A: Yes, if you use a lot of electrical tools, may I
suggest a power strip?

A: So, what makes you qualified to be our senior
electronics technician?
B: I have 3 years' experience and the required
education.

A: Tell me about the kind of work you've done in the
past.
B: I was a member of a team that put together and
tested models. Then I led a team for one year.
A: That's impressive and what about your education?

Answer Key

7


Boo · 1 Answer

Key

B: I have a two year Associates Degree from Bowler
College.
A: You have good experience. But, I do have other
interviewees to see.
B: I understand. Thank you for your time.

B: We rarely need to carry more than 251bs.
A: That's not too bad. Any other problems?
B: Sometimes sitting at a workbench for hours can
be sore on the back.
9 Suggested Answer

9 Suggested Answer

Job advertisement

Resume

Position: electronics technician
Physical description: this is a physically demanding
position. Applicants must be in good health.
Requirements: climbing ladders, sitting for long
periods of time, reaching and twisting.
Lifting limits: Applicants must be able to lift 251bs
repeatedly, on a regular basis. It is unlikely technicians
will be asked to lift more than that weight.

Education: I completed two years of college. I have
an Associates Degree in electronics.
Experience: I have previously worked as an electronics
technician for three years. My job involved assembling
and testing models. I led a team for the final year.
Suitability: I work well in a team setting, but am also
comfortable leading a group.

Unit 10

Unit 11

1 Suggested Answers

1 Suggested Answers

1 A twisting action is required when using a

1 Offices, construction sites, studios, on towers, on

screwdriver.
2 Climbing is required when using a ladder.

poles, and underground are some places an
electronics technician works.
2 Working on poles and towers requires working at
elevated heights.

F

2

2 T

3 1 reach
2 drives
3 carries

3 T
4 bends
5 sit
6 pushes

4 1 A kneeled
2 A stand
3 A crouched

7 twists

B climbs
B walk
B pulled

2

C

2 B

3 A

3 1 E

3 F

2 C

4 A

5 D
6 B

4 1 shop
2 tower

5 Suggested Answer

The part-time electronics technician position does

not include outdoor work.

T

6
B

3 F

4 carry

7 1 setting
2 high

5 more than
6 ten flights

8 Suggested Answer

8 Suggested Answer

I'm new here. What's the work like?
Overall, it's decent. It varies from job to job.
What was your worst job?
Once, I spent six hours on a ladder repairing
lighting. The repairs involved a lot of reaching and
twisting. I was pretty sore.
A: I bet. How much weight do you have to carry at
work?

8

2 T

2 C

7 1 started here
2 It varies
3 Bending and crouching

A:
B:
A:
B:

5 home

5 Suggested Answer

Technicians climb ladders when they need to be
higher up. They also climb flights of stairs to reach
job sites.

6

3 pole
4 studio

3 heights
4 prefer

5 inside
6 think

A:
B:
A:
B:
A:
B:
A:

What is your ideal job setting?
I'd like to work in a little shop where it's quiet.
Really? Why do you feel that way?
I think it is less stressful
I don't think that sounds very interesting.
Well, what kind of job setting do you like?
I like to work on a construction site, where there's
always lots of activity.
B: I don't think I agree with you on that one.

Answer Key

I


Book 1 Answer
9 Suggested Answer

Key

9 Suggested Answer

To:

From:

Subject: Part-time Position Inquiry

Electrical safety
Dos and Don'ts
Always:
Wear shoes with rubber soles.
Turn off the device before you start work
Never:
Wear shoes with metal soles
Touch bare wires

Good Afternoon,
My name is John Cohen. I'm emailing to inquire
about the part-time electronics technician position.
I have prior experience working in a radio studio.
I have also worked in a shop where I fixed small
electronic appliances.

Unit 13
Unit 12

1 Suggested Answers

1 Suggested Answers

1 0.5 as a fraction is 112.
2 A proportion is a math statement that shows two
ratios are equal.

1 Rubber is an example of a non-conductive material.
2 Workers should not wear jewelry when working
with electricity.

A

2 C

3 D

3 1 F
2 B

3 E

5 H

4 G

6 C

2

C

2

A
2 A
3 A
4 A

3 1

2 A

3 A

bare
non-conductive
contact
retain

B
B
B
B

exposed
live
shock
discharge

4

decimal

7 D
8 A

2 formula

3 fraction

5 Suggested Answer

4

A

2 D

3 E

4 B

5 C

Students will learn how to add, subtract, multiply, and
divide fractions.

5 Suggested Answer
You shouldn't touch live connection points because

you might get a shock.

F

2 F

3 T

7 1 how often I will
2 use math a lot
3 some basic math skills

63./
7 1 jewelry
2 non-conductive
3 conductive

6

4 shock
5 retain
6 warning

8 Suggested Answer

A: Stop! Don't touch the wires yet!
B: Why not?

A: Those boots have metal soles, you'll get a nasty
shock.

B: What should I do?
A: You'll need to get shoes with rubber soles.
B: Okay.
A: And remember to always check that the machine
is turned off.
B: Okay, thanks for warning me.

4 add decimals
5 a lot in
6 add measurements

8 Suggested Answer

A: Hi, I'm going to take your math class but I have a
question.
B: Sure, are you training to be an electronics
technician?
A: Yes, and I'd like to know why this math class is
important for the job.
B: It's important because technicians use math a lot
in their work.
A: Okay, what are some math skills that they use?
B: Technicians need to multiply and divide decimals.
A: I see. Do they do this a lot in their work?
B: Yes, they do. It's important for taking measurements
of parts.

Answer Key

9

Book 1 Answer Key
9 Suggested Answer

I replaced it with the right-sized wire. The
computer is now in working order. I do not foresee
any future problems.

Why I need to take this math course
Reason: Math is used by technicians a lot.
Skills: Multiply and divide decimals
Technicians do this a lot in their work.
Used for taking measurements of parts.

Unit 15
1 Suggested Answers
1 Kilo, giga, and mega are some prefixes of numbers.
2 Giga is larger than mega.

Unit 14
1 Suggested Answers

2

C

2 D

3 B

3

A

2 B

3 A

4 1

F

3 D

5

C

2 A

4 B

6

E

7

2 T

7 1 computer
2 wire

3 A
4 D

5 B

6

3 T
3 longer
4 length

5 inch
6 Thanks

2 milli

3

micro

4 symbol

F

2 T

7 1 report
2 interesting

3 T
3 working
4 tip

5 prefixes
6 remember

A: I finished reading your report earlier.
B: Oh good. What was your opinion?

A: I really liked it. You did a good job.
B: Thanks. I spent a long time writing it.

A: Let me give you some advice for writing your

B: What are you up to?
with something?
B: Sure? What's the problem?
A: I'm not sure about the wire. Do you think it's the
right length?
B: I think you should use a shorter wire.
A: How much shorter?
B: I would cut maybe a centimeter or two off.
A: I'll do that. Thank you.

9 Suggested Answer
Work Report

Date: December 13
Submitted by: Jack Farrow
Work order #: 23587
I completed work order #23587 on December 13.
This job took approximately two hours to
complete. The amplifier was not working properly
due to the wiring. The wire was about two
centimeters too long.
Answer Key

__._-

prefix

7 F

6 C

8 Suggested Answer

A: I'm just repairing this amplifier. Can you help me

.

3 1 E
2 G

Pico is the prefix for the smallest number on the chart.

8 Suggested Answer

10

3 A

5 Suggested Answer

G

It helps them calculate reaction times for certain
variables.

F

2 D

4

5 Suggested Answer

6

C

2

1 Audio voltage is measured in decibels.
2 Atmospheric pressure is measured in millibars.

-- - -

report next time.
B: Okay. Go ahead
A: Try using the symbols instead of writing out those
long numbers. You'll save a lot of time.
B: Can you give me an example?
A: "G" is the symbol for giga, or one billion.
B: That's a good idea. I will definitely do that.

9 Suggested Answer
To:
From:
Re: December Report
Hi Mr. Johnson,
Here is my report for December. I wanted to thank
you for giving me those suggestions about using
symbols for larger words. My report did not take
as long to write this time.
I will be doing some comparisons in my next
report. Would it be okay to make a table? I
thought it would be easier to compare values that
way. Please let me know.
Sincerely,
Angie Sanford


r

Audioscripts

I

Unit 1
Employee (M): Thanks for calling Electronics Superstore.
How can I help you today?
Customer (F): I want to order the Musicmaster JLX
stereo.
Employee: Okay, great. What else can I do for you?
Customer: I'd also like the speakers that go with it.
Employee: Those are also on sale right now.
Customer: Really? That's great! Can you give me the
total?
Employee: It comes out to $295.99, before taxes and
shipping costs.
Customer: Sounds good. Let me give you my billing
information.
Unit 2
Student (M): Excuse me, Professor Thompson. I was
confused by some of the stuff you said today.
Professor (F): Okay. What were you confused about?
Student: Well, can you clarify what resistance is, please?
Professor: Of course. Resistance is how much a material
opposes an electrical current.
Student: Okay. But how does it work, exactly?
Professor: Some materials are made up of insulators that
block current from passing through. This blockage is
electrical resistance.
Student: So, the less current allowed through, the more
resistance?
Professor: Exactly.

Unit 3
Apprentice tech (M): Can I ask you a question relating
to electricity?
Experienced tech (F): Sure. Go ahead.
Apprentice tech: What is impedance? I don't really
understand it.
Experienced Tech: No problem. Impedance is a type of
measurement. Are you with me so far?
Apprentice tech: Yes. That part's fine. But what does it
measure?
Experienced Tech: Basically, impedance measures the
amount that a circuit slows down the AC current.
Does that make sense?
Apprentice tech: Actually, it does when you explain it
like that. Thank you.
Experienced Tech: You're welcome.
Unit4
Apprentice (M): Hello, I'm Henry, the new apprentice. I'll
be working with you.
Professional (F): Hi, nice to meet you. Do you have any
tools yet?

Apprentice: Yes, I already have a flathead screwdriver.
Professional: That's good, but you'll need a Phillips
screwdriver, too.
Apprentice: Okay, I'll get one. Can you recommend a
certain type?
Professional: Yes, I prefer the ones with rubber handles
for a better grip.
Apprentice: Okay, thanks. And I also have Klein

needlenose pliers.
Professional: Great. I really like Klein needlenose pliers
for professional work.
Unit 5
Clerk (F): Welcome to Classic City Electric Supply. How
may I help you?
Customer (M): Hi, I have a question. What do I use to
clean wires?
Clerk: A product with naphtha easily lifts dirt.
Customer: What about an alcohol solution?
Clerk: Well, alcohol sometimes damages wires and
tubing, so I recommend naphtha. It is used on many
products.
Customer: I didn't know that. In that case, I need to
purchase some naphtha.
Clerk: It's a great cleanser. It works really well on wiring
projects.
Customer: Great, thanks for your help.
Unit6
Tutor (F): Is everything all right? Have you bonded your
components together correctly?
Student (M): No, I've made a mistake. I've melted some
solder in the wrong place.
Tutor: Don't worry. Just use a desoldering tool to remove
it.
Student: Oh really? I haven't used one before.
Tutor: Well, this is a solder sucker.
Student: How does it work?
Tutor: It has a vacuum pump inside. Let me show you
what to do.

Student: Thanks for helping me out.
Unit 7
Sales Rep (M): This is Ted at QMT Readings. How may I
help you?
Electronics Tech (F): Hi, I'm an electronics tech. My
company needs some more frequency counters.
Sales Rep: You called at a good time. We're running a
special. Frequency counters are twenty percent off
right now.
Electronics Tech: Great. I need two counters with a range
of 0.01 Hz to 3.7 GHz. What is the total cost?
Answer Key

11


Audioscripts
Sales Rep: Each frequency counter is $375. The total for
both is $750.

Electronics Tech: Does that price include shipping?
Sales Rep: Shipping is free.
Electronics Tech: Great.
UnitS
Customer (F): Hi, I'm looking for some items to set up
my new works pace.
Employee (M): Okay, great. What kind of work do you
do?
Customer: I repair electronics. What do you recommend?
Employee: You should start with a workbench that is

sturdy and large enough.
Customer: Okay, thanks. And I will also need lighting.
Employee: May I suggest a swing arm lamp for spot
lighting?
Customer: Good idea. Is there anything else that I need?
Employee: Yes, power strips are also very important.
Let's take a look at them.

Unit 11
Electronics Technician 1 (F): What's your ideal job setting?
Electronics Technician 2 (M): I think working outdoors
is the best, especially when the job is up high.

Electronics Technician 1: Why do you like to do that?
Electronics Technician 2: I like being where I can see
everything. It's also very quiet.

Electronics Technician 1: I don't think that sounds nice
at all. I'm afraid of heights.

Electronics Technician 2: Well, what kind of job setting
do you prefer?

Electronics Technician 1: I think it's better to be inside,
with my feet firmly on the ground.

Electronics Technician 2: I don't think I'd like that at all.
Unit 12
Technician (M): Stop! Don't put your hands in the
machine yet!

Apprentice (F): What's wrong?
Technician: You need to take off your jewelry. If your silver
ring touches any bare wires, you'll get a nasty shock.

Unit9
Interviewer (F): So, why do you want to become our
senior electronics technician?

Applicant (M): Well, I have both experience and the
necessary education.

Interviewer: Please tell me about your previous job duties.
Applicant: I was part of a team that assembled and
tested models.

Apprentice: I thought silver was non-conductive.
Technician: No! Silver is very conductive!
Apprentice: Oh, okay. But I've already turned off the circuit,
so I can't get a shock.

Technician: That doesn't matter. Some parts retain an
electrical charge even when the machine isn't
connected to the power supply.
Apprentice: Okay, thanks for the warning.

Interviewer: Excellent. Do you think of yourself as a team
player?

Applicant: Yes. I work well with others. But I am also

comfortable leading a team.
Interviewer: Your references are great. However, I do
have other candidates to interview.
Applicant: I understand.

Unit 13
Student (M): Hi, I'm planning to take your Math class in
the Spring.

Teacher (F): Good! Are you looking forward to it?
Student: Well, I'm wondering how often I will actually use
math as an electronics technician.

Teacher: Technicians use math a lot in their work. You
Unit 10
New Tech (M): I've just started here. What's the work like?
Experienced Tech (F): Pretty good. It varies from job to
job.

New Tech: What was your hardest job?
Experienced Tech: Once I spent six hours kneeling. I
was doing repairs. Bending and crouching can be
tough on the back sometimes, too.
New Tech: I bet. Do you have to carry a lot?
Experienced Tech: We rarely have to carry more than 30
pounds. I remember one time the elevator didn't work.
New Tech: What happened?
Experienced Tech: I had to carry 30 pounds up ten
flights of stairs! That was rough.

12

Answer Key

have to have basic math skills to be a good technician.

Student: What are some basic math skills that I'd need
to know?

Teacher: It's important to know how to add decimals.
Student: Oh, do technicians need to do that a lot in their
work?

Teacher: Yes, they usually need to add measurements
of electronic parts.

Unit 14
Experienced Tech (M): What are you working on?
Apprentice Tech (F): I'm just re-wiring this computer. But
I have a question.

Experienced Tech: What is it?


n

Audioscripts
Apprentice Tech: This wire seems to be a bit short. Do
you think I should use a longer wire or just use this
one?

Experienced Tech: I think you should use a longer wire.
It'll work better.
Apprentice Tech: What length do you think it should be?
Experienced Tech: I would use one at least an inch or
two longer than the one you have now.
Apprentice Tech: Okay, I'll do that. Thanks for the help.
Unit 15

Experienced Tech (M): Hi Jane. I just finished reading
your report.
New Tech (F): What did you think of it?
Experienced Tech: I thought it was interesting and well
written.
New Tech: Thank you. I spent a few hours working on it.
Experienced Tech: Let me give you a little tip for your
next report.
New Tech: Okay. What's that?
Experienced Tech: Use prefixes to abbreviate the large
numbers. It will save you a good amount time.
New Tech: Oh, I hadn't thought of that. I'll definitely
remember to do that.

Answer Key

13


Book 2 Answer Key
Unit 1

Probable cause: The television was probably switched
on for a long time.
Suggestion: I can fix it, it just requires a few new
components.

1 Suggested Answers
1 Physical stress, wearing out, corrosion, or damage
caused by a power surge are some causes of
product failure.
2 Lightning can cause a power surge.

1 Suggested Answers

A

2 C

3 D

3 1 F

3 E

2 C

4 A

5 D
6 B

2

Unit 2

4 1 A broke down

1 A person can cause product failure by abusing a
device.
2 The opposite of a device being in operation is the
device being idle.
B wore out
B failure
B Resistance

2 A corrosion
3 A power surge

2

2 T

4 equipment failure
5 physical stress
6 laptop

B: Excuse me, I brought my television here to be
fixed . Is it ready yet?
A: Well, I'm afraid I have some bad news. Your TV
has heat stress damage.
B: What's that?

A: It's caused by heat from the power supply.
B: What could have caused it?
A: Have you left your TV on for any long periods of
time?
B: Well yes, I went away for a long weekend and
forgot to turn it off. It was on for four days.
A: That'1I be what caused the damage.
B: Really?
A: Yes. You shouldn't put that much heat stress on
your electrical equipment.
B: So, can you repair it?
A: I can repair it, it just needs some new components.
9 Suggested Answer
Notes
Product: Television
Problem: There is heat stress damage. Some
components are damaged.
Answer Key

5 exhibited

4 sudden

3 age
4 conditions

5 in operation
6 evaluation

5 Suggested Answer

Normal wear and tear is a common problem with old
products.

8 Suggested Answer

14

3 common

4 1 manufacturer
2 idle

3 T

7 1 water damage
2 corrosion
3 beach

3 T

2 abuse

Heat stress affects large machines because heat in
the power supply damages equipment. Electrical
stress is caused by lightning and power surges.
Physical stress comes from mistreating equipment.

F

2 F

3 1 gradual

5 Suggested Answer

6

T

6

./

2 ./

4 ./

7 1 manufacturer
2 age
3 break down

4 suddenly
5 good condition
6 internal circuit failure

8 Suggested Answer

A: Good morning, this is LapTech. What can I do for
you?

B: I have a problem with my PC. It's not working. Can
you look at it please?
A: Sure. Can I ask you some questions? Who is the
manufacturer?
B: It's Star. The model is PL871.
A: How old is it?
B: It's five years old. I bought it second hand.
A: Did it stop working suddenly or gradually?
B: I've been having problems with it for a while.
A: I think it could just be normal wear and tear.
B: What should I do?
A: Bring it in and I'll see if I can fix it. But you might
need to buy a new PC.
9 Suggested Answer
Notes
Product: PC
Manufacturer: Star
Model: PL871
Age: 5 years


Book 2 Answer Key
Ask yourself the following questions about the
device:
1 Is there any activity? Do you hear a hiss or a hum?
2 Are there any scrambled words on the display?
3 Does the machine work better when you tap on it?
4 Does the device stop working after it warms up?
5 Is the remote control working correctly?

How did it stop working? It has not been running
smoothly for a while.
Suspected problem: I think the PC has normal wear
and tear.
Suggested Action: I'll try to fix it, but the customer is
probably better off buying a new one.
Unit 3

Unit4

1 Suggested Answers

1 Words and pictures are shown on the screen of
an electronic device.
2 Scrambled images might appear on the screen of
a laptop if there is a problem.

F

2 F

3 T

3 1 F

3 G

5 D

4 A

6 E

2

2 C

4 1 A hum
2 A external
3 A tap

1 Suggested Answers

1 The opposite of a closed circuit is an open circuit.
2 A short circuit is one problem that can affect
circuits.
A

2 D

3 D

7 H
8 B

3 1 G
2 D

3 H

5 B
6 E

B apart
B remote control
B eliminate

4 1 stage
2 active element
3 components

2

5 Suggested Answer

D

2 C

7 1 radio apart
2 external evaluation
3 saves time

7 F
8 C
4 short circuit

5 reservoir
6 rectified

5 Suggested Answer

To check whether the problem is a bad connection,
you can tap the device to see if it works better, or
you can check if the device stops working after it
has warmed up.

6

4 A

The purpose of the course is to give students an
introduction to electronics with a focus on circuit
operations such as open and closed circuits, repairing
circuits, and analyzing stages of a circuit.

6
4 Turn it on

5 low hum
6 power supply

8 Suggested Answer

A: Hang on a minute. What are you doing?
B: I'm just taking this tablet apart.
A: You need to do an external evaluation first.
B: Oh, really?
A: Yes, sometimes you can tell what's wrong from
the outside.

B: Okay. What do I check first?
A: Turn on the tablet. Does anything come up on
screen?
B: Yeah, there's color, but the picture is all scrambled.
A: That means there's probably a problem with a
computer chip.
9 Suggested Answer
Instruction sheet for Evaluating malfunctioning
devices
DO NOT take the machine apart.
Instead, do an external evaluation first.

F

2 T

3 T

7 1 working together
2 short circuits
3 straightforward

4 Do you think
5 open
6 bypass a leg

8 Suggested Answer

A: Hey, I'm Jack. It looks like we're working together
this week.

B: Great. I'm Jill. Have you ever worked on short
circuits before?
A: No, but it doesn't seem that hard. We just need to
figure out the cause of the short circuit.
B: Maybe some part of the circuit is broken.
A: Look there, I think a component is missing. The
circuit is open.
B: Let me see, yeah you're right. What do you
suggest we do?
A: I think we just need to insert a component to
close the circuit.
B: Okay. Let's do it.

Answer Key

15


Book 2 Answer Key
9 Suggested Answer

B: What's the difference?

A: A square wave has both straight vertical and

Short Circuit Notes
Problem: A short circuit.
Assessment: The circuit was open. There was a
component missing.
Solution: We inserted the necessary component.

This closed the circuit.

horizontal lines. A sawtooth wave has angled and
straight, vertical lines.
9 Suggested Answer
Different types of waves
Sine waves - form a smooth, flowing line.
Sawtooth waves - are made up of angled and straight,
vertical lines
Square waves - have straight vertical and horizontal
lines

Unit 5
1 Suggested Answers
1

Analog signals and digital signals are two types
of signals.
2 Sine waves, square waves, and sawtooth waves
are some types of waves.

Unit 6
1 Suggested Answers

2

F

2 T

1

Electronic capacitors, plastic capacitors, ceramic
capacitors and tantalum capacitors are types of
capacitors.
2 A capacitor's temperature range is one factor to
consider when deciding what capacitor to use.

3 F

3 1 digital
2 frequency
3 cycle
4 sawtooth wave

5 fall time
6 analog
7 Amplitude
8 signal

2
4 1 rise time
2 waveform
3 sine wave
4 square wave
5 duty cycle

6 phase relationship
7 Harmonic energy
8 analog-to-digital

converter

5 Suggested Answer
Digital signals are based on binary code. They are
easier to track and store than analog signals. That is
why some people prefer digital signals.

6

B

2 waves
3 different types

4 square wave
5 sine wave
6 at an angle

A: Do you have any experience using an oscilloscope?
B: Yeah, sure.
A: Great. Today, we're using the oscilloscope to
examine waves.
B: Okay.
A: Look at this wave. What do you think?
B: It seems like a pretty smooth signal.
A: That's right. What kind of wave do you think it is?
B: Is it a sine wave?
A: You got it. Now look at this next one.
B: Well, I see vertical lines. Is it a sawtooth wave?
A: You're close, but actually it's a square wave.

Answer Key

3

F

4 plastic capacitor
5 insulator
6 plate

4 1 range
2 rating
3 mark
5 Suggested Answer

Plastic capacitors work best in areas where moisture
is present. They work well because they have a hard
coating that keeps out water.

8 Suggested Answer

16

2 T

3 1 A electrolytic capacitor B trimmer capacitor
2 A farad
B capacitor
3 A ceramic capacitor
B tantalum capacitor

2 D

7 1 oscilloscope

T

6

c

2 A

7 1 How may I
2 capacitors
3 have a special on

4 circuit board
5 rating
6 two microfarads

8 Suggested Answer

A: Hi. Simba Electronics, how may I help you?
B: I need some 100 volt capacitors.
A: Well, we currently have some on sale rated for 0.5
microfarads. They're ceramic capacitors.
B: Actually, I need something with a 1 micro
capacitance.
A: In that case I'd recommend our PL0293 plastic

capacitors. They cost $0.50 each.
B: Great, I'll take ten.
A: Ok. So that's ten 100 volt, PL0293, plastic capacitors.


ook 2 Answer Key
Unit 8

9 Suggested Answer
Simba Electronics
Product Order Form

1 Suggested Answers

Product description: Model PL0293, 100 volt,
1 microfarad plastic capacitor
Quantity: Ten
Price/unit: $0.50 each
Unit 7

1 Electricity flows into an anode.
2 Light-emitting diodes are often used in remote
controls.

A

2 D

3 B

3 1 F
2 G

3 B
4 C

5 D
6 H

2

7 E
8 A

1 Suggested Answers
1 Quartz is used in crystal resonators.
2 A resonator is connected to a circuit board by its
leads.

4 1 band
2 pulse

3 maximum
4 biasing element

5 Suggested Answer

A

2 C

3 B

3 1 B
2 B

3 A

5 A
6 A

2

4 B

No, a diode is a one way valve.

4 piezoelectric effect
5 vibrate
6 slice

4 1 encased
2 Ceramic
3 crystal

T

6

2 F

3 F

7 1 What do you think
2 has been exceeded
3 replacement part

4 bridge rectifier
5 power supply circuit
6 the part number

8 Suggested Answer
5 Suggested Answer

A: What do you think is wrong with the remote control?

A crystal has two leads while a resonator can have
either two or three.

6

F

2 T

3 F

7 1 no longer working
2 battery
3 brand new one

4 used in keeping time
5 Don't worry
6 broken crystal

8 Suggested Answer

A: Hi, What can I do for you?

B: I don't know. Maybe it's the diode.

A: What do you think happened to the diode?
B: Sometimes they burn out or die from exceeding
the PIV.
A: We could look for a replacement on line.
B: Okay, I think that's a good idea.
A: Is this a double rectifier?
B: No, it's just a small diode.
A: What is the part number? It's located near the
band.
B: The part number is DE69052.

B: The clock on my DVD player doesn't work.

A: My guess is a crystal inside is damaged.
B: Is that serious?

A: Don't worry, I can fix it.
B: Oh, good. Will it take long?
A: No, "" have it working good as new by tomorrow

morning.
B: Great. Thanks.
9 Suggested Answer
JD Electronics repair
Repair Ticket Number: 299040
Customer name: Joe Smith
What is the problem? Mr. Smith's DVD player has a
broken clock.
Repair procedure: Check the crystals on the circuit
board. Replace any broken crystals. Check the clock.

9 Suggested Answer
Troubleshooting Guide for Your Remote Control
If your remote control stops working, it could be
the diode. It might have died or become worn out.
This can happen if the PIV was exceeded.
For a replacement part, you can look online. Be sure
to have the part number ready. You can find it by
locating the band.
Unit9
1 Suggested Answers
1 Surface mount fuses and slow-burn fuses are two
kinds of fuse.
2 Fuses can be in the shape of a cylinder or can
be rectangular.
Answer Key

17

Book 2 Answer Key
C

2 B

3 D

3 1 F

3 C
4 G

5 B

2

2 D
4

6 A

5 Suggested Answer

2 exceeded

blew

Chips are widely used because they are very small
and work very well. They can hold various amounts
of information and can be used in virtually any

electronic device.

7 H
8 E

3 protect
6

5 Suggested Answer
The holder is attached to the DVD player with metal
springs.

6

F

2 T

T

2 T

3 T
4 deserve
5 finished
6 next two weeks

7 1 microchip
2 planning stage
3 great job

3 T
8 Suggested Answer

7 1 please give me
2 order a new fuse
3 from a hardware store

4 exactly the same
5 Could you please
6 slow-blow fuse

A: Hi. How's the development stage of that new chip
working out?
B: It's going well. We're almost ready to start
production.
A: That's great. I wanted to tell you and your team
congratulations. You've all done an amazing job
on this project.
B: Thank you. We've put a good amount of effort into
it.
A: Well it shows. This project is coming along better
than expected.
B: Thank you.
A: When do you think you'll be ready to start
production?
B: Probably within the next few days.

8 Suggested Answer

A: Hi, thanks for calling. How can I help you?
B: I have a problem with my TV.
A: Okay, when did you buy your TV?
B: I bought it last summer.
A: And could you give me the brand and the model
name please?
B: Yes, it is a Subsonic, model CFV 2000.
A: Alright, you're going to need a new fast -blow fuse.
B: Can I order it from you now?
A: Sure, no problem.
9 Suggested Answer

9 Suggested Answer

Employee Phone Script

Project Notes

Employee: Hello, thanks for calling. How can I help
you today?
Customer: I have a problem with my TV.
Employee: Okay, when did you purchase your product?
Customer: I bought it in May.
Employee: Thanks, could you give me the brand and
model name, please?
Customer: Yes, it is a Subsonic, model CFV 2000.

Project: New microchip
Stage of development: Development
Next stage: Production Stage

Additional notes: The team on the project is doing
a great job; should be ready to start production within
the next few days.

Unit 11
1 Suggested Answers

Unit 10

1 Carbon composition resistors, wire-wound resistors,
and metal oxide resistors are some types of resistor.
2 A resistor's resistance is identified by color code.

1 Suggested Answers
1 An LSI chip is one type of chip.
2 A microscope is needed to closely examine a
microchip.

A

2 C

3 1 A
2 D

3 E

5 B

4 F

6 C

2

4

18

graphics card
Answer Key

3 B
7 G

2 microscopic

3 fan

2

A

2 D

3 B

3

C

2 E

3 A

4

A
B
2 A
B

4 B

represent
col or code
opposition
carbon composition resistor

5 D


r

Book 2 Answer Key
3 A metal oxide resistor
B wire-wound resistor

5 Suggested Answer

Customers can click to find out more information
about the resistance curve.

5 Suggested Answer

The tolerance number was represented by colored
bands.

6

T

2 F

2 first thing
3 already did that

D

2 B

7 1 an audio system
2 audio channels
3 stereo system

3 T

7 1 defective resistor

6

4 bad resistors

5 I found one

8 Suggested Answer

6 color bands

A: Good morning, Topton Electronics.
B: Hi, I need a potentiometer. What would you
recommend?
A: What are you using it for?
B: It's for an electric guitar. It will control tone.
A: How much resistance do you need?
B: One hundred thousand ohms.
A: I have an audio pot that meets that spec. It sells
for $2.
B: I'll take it.

8 Suggested Answer

B: Could you help me replace a defective resistor?

A: Sure. It's not that hard to do. First test the circuit.

B: Why?
A: To identify any bad resistors.
B: Ok. I think I found the problem. This resistor isn't
limiting current correctly.

A: Yeah. I think you should replace it with a metal
oxide resistor.
B: Ok. I'll do it right away.
A: Be careful, you don't want to touch any other
components. Be sure to use diagonal cutters.

9 Suggested Answer
Topton Potentiometers
Customer Service Survey
Why did you contact Topton? I called to order a
potentiometer for my electric guitar. I needed one to
control the tone.
How would you rate our customer service?
III excellent
0 good
0 poor
0 other
Please explain: The customer service representative
was excellent. He was very polite. When I explained
what I needed, he helped me find the exact product.
He recommended an audio pot with one hundred
thousand ohms resistance, that cost two dollars.
Thank you!

9 Suggested Answer
TC Radio Repair
Work order number: 48950
Customer name: Joe Miller
Work performed: Identified defective resistor. It did
not limit current correctly. Removed defective resistor

with diagonal cutters. Replaced it with a metal oxide
resistor.
Unit 12

1 Suggested Answers
1 The shaft, wiper, terminals, and substrate are
some parts of a potentiometer.
2 A potentiometer's resistance value is graphed on
a resistance curve.

Unit 13

1 Suggested Answers
1 A relay is one kind of switch.
2 A switch can be normally open or normally closed.

T

2 T

3 F

2

T

2 F

3 T

3 1 A

3 B
4 F

5 E
6 D

3 1 B
2 E

3 A
4 F

5 D
6 C

2

2 C

4 1 rheostat
2 log taper pot
3 wiper

4 audio pot

5 what I thought
6 resistance

4 linear taper pot
5 trim pot
6 resistance curve

4 1 normally closed
2 shut down
3 variety

4 poles
5 contacts
6 unconnected

Answer Key

19


Book 2 Answer Key
5 Suggested Answer
The quality control of switches is important because
even though switches are small, their failure can
cause large or complex electronics to shut down.

4 1 A Depletion mode
2 A MOSFET
3 A collector

B base
B emitter
B bipolar transistor

S Suggested Answer

6

C

2 A

Transistors control the flow and quantity of current.
They can switch and amplify electronic signals.

7 1 corroded switch contact 4 timeframe
2 in working order
5 keep the keyboard
3 confirm
6 assuming the issue

6

8 Suggested Answer

7 1 inconvenience
2 after one week
3 this model

A: Can you tell me what's wrong with my phone jack?
B: There are a few possibilities. I suspect that the
problem is a damaged relay.
A: Okay. How quickly can you repair that? I really

need it to work again.
B: I understand. But I need to examine it to be sure.
A: How long will that take?
B: Only a few hours, if it is a damaged relay, I can
replace it.
A: Thanks.

4 serial number
5 explains it
6 replace the transistor

already broken.
B: Really? Can I examine it?
A: Go ahead, but I don't know if I still want it. I mean
it broke after only one week.
B: I'm so sorry for all the trouble. Customers usually
love this model.
A: Really?
B: Okay, I think I know what the problem is. Your
stereo has a faulty transistor.
A: Is it serious?
B: No, I can just replace it.
A: What guarantee do I have that something else
won't go wrong?
B: How about I give you a three year warranty, free
of charge? Would that help?
A: I guess that will work. Thanks.

Problem: The phone jack does not work.
Suspected cause: I think a relay is damaged.

Action to take: I will take apart the phone jack and
examine it thoroughly. I will replace the relay if needed.
If that is not the problem, I will call the customer.
Timeframe: Approx. 4 hours

9 Suggested Answer
Repair Needed

1 Suggested Answers
1

Bipolar transistors and junction field effect transistors
are two types of transistor.
2 The gate, source, and drain are the three terminals
in a FET transistor.

2 Bipolar: three terminals called the base, emitter and
collector. The base changes the current flow between
the emitter and collector.
JFET: three terminals called the gate, source and
drain. Voltage applied to the gate changes the
passage of current between the source and drain.
MOSFET: Similar to the JFET. Has two modes:
enhancement mode and depletion mode. In depletion
mode, transistors are "normally on." In enhancement
mode they are "normally off."

3 1 F

3 G

5 E

2 D

4 A

6 C

Answer Key

3 F

A: Last week I bought this stereo from your store. It's

Repair Order

20

2 T

8 Suggested Answer

9 Suggested Answer

Unit 14

T

7 B

Item affected: Stereo
Repair needed: This stereo has a faulty transistor.
Change out the transistor for a working one.
Suggested customer compensation: Offer customer
a three year warranty, free of charge.

Unit 15
1 Suggested Answers
1

A switching regulator and a linear regulator are
two types of voltage regulators.
2 Most voltage regulators use a zener diode.

A

2 C

3 A

3 1 B

3 H

2 E

4 A

5 D

6 F

2

7 C
8 G


Book 2 Answer
4 1 regulate
2 switching regulator

.
I
I

Key

3 charge up

5 Suggested Answer
Regulators are important because they keep many
electrical devices working properly and more
efficiently. Regulators ensure that a device is not
using too much or too little power .
6

T

2 F

3 F

7 1 a problem
2 of regulator
3 work efficiently

4 linear regulator
5 switching regulator
6 finish up

8 Suggested Answer

A: Hi. What are you working on?
B: I'm fixing this TV. But I'm having a problem.

A: What's wrong?
B: I don't know which regulator to install.

A: Well it needs to produce excellent sound, since
you're installing it into a TV.
B: I know. I thought of that.
A: Do you think a switching regulator would work?
B: I don't know. I actually think a linear regulator
would be the better choice.
A: You're right. A linear regulator would be the best
for sound quality.
B: So we both think that linear regulator is the right
option?
A: Yes, we do.

B: Okay. I'll go ahead and install it now.

9 Suggested Answer
Work Report
Date: December 18
Submitted by: Brad Compton
Work Order #: 46984
I completed work order #46984 on December 18. I
spent three days repairing the TV. The device
needed a new regulator. I decided that a linear
regulator would be the best option. I decided this
because a linear regulator produces better sound
than a switching regulator.
I detected no other problems. So I did not alter any
other components. The TV is now in good working
order.

Answer Key

21


Audioscripts
Unit 1
Customer (M): Excuse me, my laptop broke down and I
brought it here last week. Have you looked at it?
Technician (F): Yes, of course. I'm afraid I have some
bad news. There's some water damage.
Customer: What does that mean?
Technician: There is some corrosion in the connections.

Possibly the laptop got wet at some point.
Customer: It probably happened when I took it to the
beach.
Technician: Well, I hate to tell you this, but salt water is
a big cause of equipment failure.
Customer: Is it?
Technician: Yes. People put a lot of physical stress on
their electronic equipment these days.
Customer: So, can you repair my laptop?
Technician: I can, but I'm afraid it will be expensive. It
would be cheaper to buy a new one.
Customer: But I've only had it two years!
Technician: I'm sorry, but components inside the laptop
are damaged. That shortens the product's lifespan.
Unit 2
Technician (F): Hello, this is LapTech. Can I help you?
Man (M): Yes, I've got a problem with my laptop. It's
stopped working. I'd like for you to take a look at it.
Technician: Of course. Can I ask some questions first?
Who is the manufacturer?
Man: It's Bell. The model is BL0899.
Technician: And its age?
Man: It's about 3 years old. I bought it new.
Technician: Did it break down suddenly, or was it
gradual?
Man: It was fine and then one day it suddenly stopped
working.
Technician: And is it in good condition?
Man: Sure. I look after it well, I don't abuse it.
Technician: Well, it sounds like an internal circuit failure to

me. Your model has a lot of parts in common with the
BL088. That one has a problem with circuit failures.
Man: That's not what I wanted to hear.
Technician: Bring it by the shop anyway, just so I can be
sure.
Unit3
Tech 1 (F): Hey, Bill. Hang on a minute. What are you
doing?
Tech 2 (M): Oh, hi Janice. I'm just taking this radio apart.
I need to find out what's wrong with it.
Tech 1: Did you do an external evaluation first?
Tech 2: No. Do I need to?

22

Answer Key

Tech 1: You should. Sometimes you can tell what's wrong
from the outside. It's easier and it saves time.
Tech 2: Okay. What should I check first?
Tech 1: Turn it on. Does it work at all?
Tech 2: It does. It's not totally dead, there's a low hum.
Do you hear it?
Tech 1: Yeah ... I hear it.
Tech 2: What does that mean?
Tech 1: It means there's probably a problem with the
power supply.
Tech 2: Huh. I never knew checking the outside could
help you figure out what's wrong on the inside.
Tech 1: It's always best to get as much information as

you can before opening the device.
Unit4
Student 1 (F): So, I guess we're working together this
week. I'm Andrea.
Student 2 (M): Nice to meet you. My name's Mark. Have
you ever dealt with short circuits before?
Student 1: No, but it sounds fairly straightforward. We just
need to figure out why the circuit failed.
Student 2: Do you think that the circuit is broken in some
way?
Student 1: I don't see the problem, but the circuit is
definitely open.
Student 2: Well something caused the current to bypass
a leg of the circuit.
Student 1: It looks like one of the wires might be the
problem.
Student 2: Do you think the wire's insulation is damaged?
Student 1: Probably. Let's try replacing the wire.
Unit 5
Experienced Tech (M): So, have you ever used an
oscilloscope before?
Apprentice (F): Yes, I have. But I'm not familiar with this
model.
Experienced Tech: No problem. Today, we're going to
use the oscilloscope to look at waves.
Apprentice: Okay.
Experienced Tech: Do you know how to tell the different
types of waves apart?
Apprentice: I look at the shape, right? I mean both the
square wave and the sawtooth wave have different

rise and fall times.
Experienced Tech: Very good. And unlike the sawtooth
and square waves, the sine wave forms a smooth,
flowing signal.
Apprentice: Got it. How did the sawtooth wave get its
name?


-;"

Audioscripts
Experienced Tech: Well, the sawtooth wave rises at an
angle. At its peak, it rises fast and falls slow. Then
the pattern repeats. It looks like the teeth of a saw
blade.
Apprentice: Oh, that makes sense. So, the sawtooth
wave has both vertical and angled lines, whereas the
square wave has horizontal and vertical ones.
Experienced Tech: Exactly.
Apprentice: Thanks for explaining.

Unit 6
Clerk (F): Thank you for calling Simba Electronics. How
may I help you?
Customer (M): I need some capacitors, but I'm not sure
which model to get.
Clerk: Well, we currently have a special on our AVP
345005, which are mylar, very water resistant.
Customer: Actually, I'm repairing a circuit board for a
remote control, so it doesn't need to be water resistant.

Clerk: No problem. What rating do you need?
Customer: It has to handle 50 volts and at least two
microfarads.
Clerk: In that case I'd recommend our AVE 304050.
They're 39 cents a piece.
Customer: Great, I'll take three.
Clerk: Ok. So that's three electrolytic capacitors model
number AVE 304050.
Customer: No, that's not right. I actually need five.
Clerk: Not a problem. I'll just change your order to five
electrolytic capacitors model number AVE 304050.
Customer: Perfect.

Unit 7
Tech (M): Hi, welcome to JD Electronics Repair. What
can I do for you?
Customer (F): Well, I accidentally dropped my cell phone
and the clock function is no longer working.
Tech: Have you checked the battery?
Customer: Yes, I got a brand new one. Everything else
seems to be working fine, but the clock is frozen at
12:03, the time when I dropped it.
Tech: My guess is that the crystal used in keeping time
cracked when you dropped the phone.
Customer: Is that serious?
Tech: Don't worry, I can fix it.
Customer: Thank goodness. What will you do to it?
Tech: I'll have to open it up, then remove the broken
crystal and replace it with a new one.
Customer: Is that going to take a long time?

Tech: I'll have it working good as new by tomorrow
afternoon.
Customer: Great. Thanks.

UnitS
Student 1 (M): So, we have to fix this radio for class.
Student 2 (F): Do you have any ideas? Maybe it's the
diode?
Student 1: Maybe. What do you think happened to it?
Student 2: I'm not sure, but they can die if the peak
inverse voltage has been exceeded.
Student 1: Okay, let's look up a replacement part online,
just in case.
Student 2: Alright, would it be a bridge rectifier?
Student 1: I don't think so. It's not in the power supply
circuit.
Student 2: Okay, can you tell me the part number? It
should be located near the band.
Student 1: I think it's IN5567.
Student 2: I might have found the replacement part. Now
could you tell me the PIV number?
Student 1: Yes, it says 220 PIV.
Student 2: Okay, let's run some tests to see if that's what
it is.

Unit 9
Employee (M): Thank you for calling Mr. Electronic. How
can I help you today?
Customer (F): Hi, I have a question about my DVD player.
Employee: Okay, when did you purchase the DVD player

from us?
Customer: I bought it two months ago and I think a fuse
has blown.
Employee: Okay, please give me the brand and model
name on the player.
Customer: Yes, it's a Star, model XYZ1.
Employee: Thanks. You'll need to order a new fuse from
us to replace it.
Customer: Can I just get a regular fuse from a hardware
store?
Employee: Well, you can look, but you have to make sure
that it's exactly the same rating.
Customer: Could you please describe the right fuse in
more detail for me?
Employee: Yes, it needs to be a slow-blow fuse and the
same small size as the old one.
Customer: Okay, I'll look in the store tomorrow. Thanks.

Unit 10
Executive (F): Hi Mr. Sanders. How's the work on that
new microchip coming along?
Developer: It's going great. We're in phase 2 of the
planning stage.
Executive: Good. I just wanted to say that you and your
team did a great job developing the concept.

Answer Key

23

Audioscripts
Developer: Thank you. We worked really hard on it. .
Executive: I can tell. You all deserve a pat on the back

Customer: No wait a minute. One needs to be fifty

for all your work.
Developer: Thank you. We're really trying to make this
chip more durable and efficient than the ones we've
been producing.
Executive: I'm sure they will be. When do you think you'll
be finished planning?
Developer: We're hoping to finish within the next two
weeks.
Executive: Great. Let me know when you're ready to
move onto the next stage.

Manufacturer: Ok. We make one that meets those

Unit 11
Apprentice Tech (F): Could you explain how to replace
a defective resistor?
Senior Tech (M): Sure. It's not that hard to do. The first
thing is to test the circuit to find which resistor or
resistors are bad.
Apprentice Tech: Okay. I already did that.
Senior Tech: So, did you identify any bad resistors?
Apprentice Tech: Yes. I found one. But I haven't removed
it yet.

Senior Tech: Good. Are the color bands still visible?
Apprentice Tech: Yes.
Senior Tech: Then, what you need to do is calculate its
value based on the color code of the bands. After
that, you remove it.
Apprentice Tech: I cut the wire leads, right?
Senior Tech: Yes, but the tricky part is that you don't
want to touch any other components. So be sure to
use diagonal cutters.
Apprentice Tech: I see.
Senior Tech: Then finish up by soldering in a new resistor
with the same value as the original.
Apprentice Tech: Thanks.

Unit 12
Manufacturer (M): Good morning, you've reached Gamma
Potentiometers.

Customer (F): Hi, I'm calling because I'm putting together
an audio system from a kit. I need a pot to connect to
a volume control knob. What would you recommend?
Manufacturer: Will it control one or two audio channels?
Customer: Two, I think. This is a stereo system.
Manufacturer: Definitely two then. So you want a dualganged audio pot.
Customer: That's what I thought, but I wasn't sure. Which
one do you think is the best for this job?
Manufacturer: How much resistance do you need?
Customer: I need fifty thousand ohms.
Manufacturer: Is that for both pots?

24

Answer Key

thousand and the other is twenty five thousand.
specs. It sells for $1.95 per unit.

Customer: I'll take it.
Unit 13
Customer (M): So, do you know what's wrong with my
computer keyboard? It's an old one, but I really like it.

Tech (F): Well, there are several possibilities. I think the
problem is probably a corroded switch contact.

Customer: Great. How quickly can you repair that? I
really need my keyboard back in working order.

Tech: I can't confirm the problem until I've examined the
keyboard more thoroughly.

Customer: What kind of timeframe are we talking about?
Tech: I'll need to keep the keyboard for forty-eight hours.
Customer: Can you fix it in that amount of time?
Tech: Yes, assuming the issue is the switch contact. If
it's something more serious, I'll give you a call.

Customer: Okay. What does the switch contact do,
anyway?

Tech: It connects a circuit inside the keyboard. Without
a completed circuit, the keyboard's power button
doesn't work.
Customer: So that's why it won't turn on?
Tech: Exactly.

Unit 14
Customer (F): I bought this computer here last week, and
I'm already having problems with it.

Tech (M): I apologize for the inconvenience. Can I take
a look at it?

Customer: Sure, but I don't know that I still want it. What
kind of computer breaks after one week?

Tech: I'm so sorry it's given you difficulties. We don't
usually have problems with this model.

Customer: Really?
Tech: Okay, I think I know what the issue is. According to
your computer's serial number, it's part of a batch that
got faulty transistors.
Customer: Well, that explains it.
Tech: I can replace the transistor fairly easily.
Customer: How do I know something else isn't going to
go wrong with it?
Tech: How about I give you an extended warranty for
free?
Customer: So, I wouldn't have to pay anything if it breaks

again?
Tech: No, you won't. Although I really doubt you'll encounter
any more problems.
Customer: Okay, thanks.


Audioscripts
Unit 15

Tech 1 (F): Hi, Brad. Are you almost done fixing that
laptop?

Tech 2 (M): Not yet. I'm having a bit of a problem.
Tech 1: What's the problem?
Tech 2: I'm still deciding on what type of regulator to
install.

Tech 1: Well whichever type you choose needs to work
efficiently since it won't be attached to a permanent
power source.
Tech 2: I know. That's what I was thinking.
Tech 1: Which would work better, a switching regulator
or a linear regulator?
Tech 2: I think the switching regulator works more efficiently.
Tech 1: I think you're right.
Tech 2: So we both agree that the switching regulator
would be the better choice in this scenario?
Tech 1: Yes, I think so.
Tech 2: Now that we've decided to use the switching
regulator, I can go ahead and finish up the work on

this laptop.

Answer Key

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