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Chọn câu sai: * 1 điểm A. Đối với vật dẫn thông thường hiệu điện thế càng lớn thì dòng điện càng lớn. B. Hiệu điện thế của nguồn điện tạo ra dòng điện C. Bóng đèn trong gia đình có ghi 220V tức là trong khi đèn sáng hiệu điện thế không vượt quá 220V. D. Khi nguồn đã mắc vào mạch thì hiệu điện thế nhỏ hơn hiệu điện thế khi chưa mắc vào mạch.
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