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Physics, 12.07.2021 18:20 dontworry48

Cho mạch điện như hình vẽ u = 12V r1 = 20 ôm, R2 = 5 ôm, r3 = 8 ôm, có một vôn kế v có điện trở rất lớn và một Ampe kế có điện trở rất bé a) Tìm số chỉ vôn kế khi nó mắc giữa A và N trong hai trường hợp K mở và K đóng.

b) Thay vôn kế bằng ampe kế. Hỏi những câu a

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Cho mạch điện như hình vẽ u = 12V r1 = 20 ôm, R2 = 5 ôm, r3 = 8 ôm, có một vôn kế v có điện trở rất...
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