问汽车的电力从何以来?

Once you are starting the engine of the car and the shaft of the engine will rotate the dynamo of the car and generate the electricity as well. That's why some drivers will press on the oil padel to charge the battery before turn off the engine.

汽车电池只是扶助, 主要是靠 engine --> 发电

汽车主要由引击转动皮带到发电机“打男磨”发电机产生电流(AC),去到整流器(DC),然后供电和充电电池主要用于起动引击,充电和保给汽车备用电器