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fgjiuhiu
2 năm trước

câu 1: khi mắc một bóng đèn vào hiệu điện thế 6V thì dòng điện chạy qua bóng đèn có cường độ 400mA năng suất tiêu thụ của đèn này là A. 400W B.240W C. 24W D. 2,4W

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thumoc
2 năm trước

Đáp án:

$D$ 

Giải thích các bước giải:

Công suất tiêu thụ của đèn: \(P = UI = {6.400.10^{ - 3}} = 2,4W\)

Hi Hi
2 năm trước

Đáp án:

D

Giải thích các bước giải:

 I=400mA=0,4A

Năng suất tiêu thụ

P=U.I=6.0,4=2,4W

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