Physics, 07.09.2021 14:00 rhaquan66766

Cho mạch điện có điện chở R =50 Ω , cho dòng điện có cường độ 1,8A qua điện trở . a) tính hđt của nguồn điện . b) thay R bằng R' khi đó cđdđ qua R' giảm ba lần tính R' . c) thay R băng R'' = 15 Ω khi đó cđdđ qua R'' là bao nhiêu?

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Cho mạch điện có điện chở R =50 Ω , cho dòng điện có cường độ 1,8A qua điện trở . a) tính hđt của ng...