cho mạch điện gồm 2 đèn mắc nối tiếp a) Cường độ dòng điện qua mạch chính là 1 A. Tính cường độ dòng điện qua đèn 1 và đèn 2 b) Hiệu điện thế hai đầu mạch là 4V, hiệu điện thế 2 đầu đèn 1 là 2V. Tính hiệu điện thế 2 đầu đèn 2 giúp mk nhanh nha. Hứa vote cho tất cả các bạn 5 sao

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