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phuongchanh002
2 năm trước

Biết Uab =12V;R1=6 ôm ; R2=9 Ôm Đ:6V-6W Tính điện trở của Đèn Tính điện trở của đoạn mạch AB vừa I qua mạch chính Tính I qua đèn và nhiệt lượng toả ra của đèn trong thời gian 5p

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Nguyễn Trường An
2 năm trước

Đáp án: a./ 6 ôm

 b/ 

Giải thích các bước giải:

 a/ ta có :P= U^2/ R suy ra: R= U^2/P =6^2/6 =6 ôm

b/ 

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