:Vẽ sơ đồ mạch điện gồm : 1 nguồn gồm 2 pin mắc nối tiếp ; 1 bóng đèn ; 1 khóa K đóng, 1 ampe kế và các dây dẫn. Sau đó, vẽ chiều dòng điện trong mạch bằng các mũi tên.

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