Câu 3: Trong mạch điện có sơ đồ như hình 28.5, ampe kế có số chỉ I = 0,54A. Biết cường độ dòng điện đi qua đèn Đ1 lớn gấp hai lần cường độ dòng điện đi qua đèn Đ2. a) Hãy tính cường độ dòng điện l1 và I2 tương ứng đi qua các đèn Đi và Đ2. b) Hãy so sánh hiệu điện thế giữa hai đầu các đèn Đi và Đ2.

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