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ngahoangthi99
2 năm trước
Một mạch điện có sơ đồ như hình vẽ biết R1 = 9 ôm R2 = 15 ôm R3 = 10 ôm dòng điện I qua R3 có cường độ là 0,3 Ampe. a Tính Điện trở tương đương của toàn mạch. b Tính cường độ dòng điện qua các điện trở R1 R2
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