如图所示,灯泡和电阻串联后接在电压为U的电路中,己知电阻的阻

如图所示,灯泡和电阻串联后接在电压为U的电路中,己知电阻的阻值为R,通过电路的电流为I,则灯泡在时间t内消耗的电能是

AUIt               B

CI2Rt         DUItI2Rt

答案

D

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