a. vẽ sơ đồ mạch điện gồm : 1 nguồn điện (1 pin), 1 khóa K đóng , 2 bóng đèn mắc nối tiếp dây dẫn . Dùng mũi tên xác định chiều dòng điện chạy trong mạch khi khóa K đóng ? b. Biết U = 12 V ; U1 = 5V tính U2 = ? (V) Biết : I2 = 0,8 A tính I1= ? (A) ; I = ? (A)

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