KIỂM TRA 1 TIẾT
Mơn: Vật lý 11 Nâng cao
Thời gian làm bài: 45 phút
Họ, tên thí sinh:..................................................................... Lớp: .............................Mã đề: 02
Bài tập. Bài 2: Cho mạch điện như hình vẽ, trong đó nguồn E = 6 V và có điện trở trong r, R1= 5
Ω
.
Điện trở của vôn kế rất lớn, RA = 0. Biết vôn kế chỉ 2 V và ampe kế chỉ 0,5 A.
a/ Tính điện trở trong r của nguồn điện.
b/ Thay điện trở R2 bằng bóng đèn ghi ( 4V – 3 W).
Bóng đèn có sáng bình thường hay không? Để bóng sáng bình thường phải thay điện trở R 1 bằng điện trở R3 có
giá trò bao nhiêu?
Bài làm
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