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tranngocle9a2
2 năm trước
2.8... Khi mắc một bóng đèn vào hiệu điện thế 220V thì dòng điện chạy qua nó có cường độ là 0,25A. a) Tính điện trở và công suất của bóng đèn khi đó. b) Bóng đèn này được sử dụng như trên trung bình 5 giờ một ngày. Tính điện năng mà bóng đèn tiêu thụ trong 30 ngày theo đơn vị Jun và số đếm tương ứng của công tơ điện.
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