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diepbangdao
2 năm trước
một bóng đèn có ghi 12V, được mắc trong mạch điện với hiệu điện thế U1=6V thì cường độ dòng điện là I1, nếu hiệu điện thế đặt vào là U2=9V thì cường độ dòng điện là I2. so sánh cường độ dòng điện I1 với I2 ? giải thích?
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