阿Q吧 > （2014?南京）LED灯具有节能、环保等特点，如图是额定电压为220V、额定功率为4.4W的LED灯泡，该灯泡的额

（2014?南京）LED灯具有节能、环保等特点，如图是额定电压为220V、额定功率为4.4W的LED灯泡，该灯泡的额

2025-03-31 07:56:56
推荐回答（1个）
回答1：

（1）该灯泡的额定电流是I=

P
U
=
4.4W
220V
=0.02A；
（2）消耗的电能W=Pt=0.0044kW×5h×30=0.66kW?h
（3）设两种灯泡正常发光的时间为t，
∵P=
W
t
，
∴LED消耗的电能为W1=P1t=0.0044kW?t，白炽灯消耗的电能为W2=P2t，
∵在达到相同亮度的条件下，LED灯可以节约90%的电能，
∴
P2t?0.0044kWt
P2 t
=90%，
解得：P2=0.044kW=44W．
故答案为：0.02；0.66；44

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