题目内容
汽车电动机启动时车灯会瞬时变暗。如图所示,在打开车灯的情况下,电动机未启动时电流表读数为10 A,电动机启动时电流表读数为56A,若电源电动势为12.0V,电源内阻为0.05
,电流表内阻不计,不考虑电流变化对车灯电阻的影响,则因电动机启动,车灯的电功率减少( ) 
2021-07-21
A.41.4W
B.49.5W C .70.5W D.73.6W
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