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Cho các dụng cụ điện gồm 1 nguồn điện 1 pin, bóng đèn, 1 công tắc. Vẽ sơ đồ mạch điện kín với công tắc đóng. Vẽ sơ đồ mạch điện gồm những dụng cụ điện như trên và mắc thêm 1 ampe kế đo cường độ dòng điện chạy trong mạch điện Vẽ sơ đồ mạch điện gồm những dụng cụ điện như câu b và mắc thêm 1 vôn kế đo hiệu điện thế giữa hai đầu bóng đèn
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