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2 năm trước
2 điện trở mắc sống sống giữa 2 điểm có hiệu điện thế không thay đổi cường độ dòng điện trong mạch chính đo được 2A biết R1 =20 ôm, R2 =30ôm. a)Tính I qua mỗi điện trở b) nếu mắc song song thêm 1 điện trở r3 nữa thì I trong mạch chính bây giờ là 5A. Tính R3
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