Câu 1 thì làm câu d, còn 2 thì làm câu c thôi nha:1/ Trong mạch điện có sơ đồ sau(mắc nối tiếp), Ampe kế A1 có số chỉ 0,45 A. U12=2V;U23=4V. Hãy cho biết: a. Số chỉ của Ampe kế A2. b.Cường độ dòng điện qua các bóng đèn Đ1 và Đ2 c. Tính U13 d. Thay hiệu điện thế U13 bằng U13=12 V. Tính U12 và U23 2/Cho mạch điện có sơ đồ sau(mắc song song). Biết HĐT giữa hai đầu đèn 1 là U12=6V, cường độ dòng điện I1=0,2A; I=0,6A a.Tính HĐT giữa hai đầu đèn 2. b. Cường độ dòng điện I 2 c.Thay cường độ dòng điện I bằng I'=0,12A.Tính I1 và I2 Hứa vote 5*

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