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refer
: Chiều dòng điện là chiều đi từ cực dương qua vật dẫn về cực âm của nguồn điện.
b,![Vẽ sơ đồ mạch điện gồm 2 pin 1 công tắc 1 bóng đèn chỉ rõ chiều dòng điện](data:image/png;base64,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)