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Ánh Duyên
2 năm trước

Một dây dẫn đien bằng nikelin co chieu dai 100m tiết diện 0,5m2 dc mắc vao nguon dien co hieu dien the 120v 1.tinh dien tro của day 2.tinh cuong do dong dien qua day

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Nguyễn Thanh
2 năm trước

Đáp án:

 

Giải thích các bước giải:a,R=0.4*100:0,5

 b,I=120/R

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