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ctvtienganh3
1 năm trước
Hai nguồn điện có suất điện động như nhau E1 = E2 = 2V và có điện trở trong tương ứng là r1 = 0,4 Ω và r2 = 0,2 Ω được mắc nối tiếp với nhau và mắc với diendj trở R thành mạch kín . biết rằng khi đó , hiệu diện thế giữa cực dương so với cực âm chênh lệch 0.5 v so với nguồn kia . tìm r
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