电容的作用：
　　1,电容在交流电路里可将电压维持在较高的平均值!(近峰值).(高充低放),可改善增加电路电压的稳定性。
　　2,对大电流负载的突发启动给予电流补偿!电力补偿电容组可提供巨大的瞬间电流!可减少对电网的冲击。
　　3,电路里大量的感性负载会使电网的相位产生偏差,(感性元件会使交流电流相位滞后,电压相位超前90度!）.而电容在电路里的特性与电感正好相反，起补偿作用。

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后武满1893在一个正弦交流电路中,电压和电流的频率是相同的,但初相位不一定相同,这是为什么?举例说明! -
储急轮18745158654 ______[答案] 很普遍,同频率电压和电流的相位,根据负载性质的不同时不一样的.比如纯电阻电路,电压和电流相位就是相同的,电感和电容电路,由于电流和电压不能突变,相位上也是超前和滞后的关系.

后武满1893在纯电容电路中,从相位上看电压 电流,在纯电感电路中,从相位上看电压 电流.(填超前或滞后)1、在纯电容电路中,从相位上看电压( )电流,在纯... -
储急轮18745158654 ______[答案] 电容是电流超前电压90° 电阻是电压与电流同相位 电感是电压超前电流90° 问题补充: 1,滞后 2,超前

后武满1893u和i是同频率正弦量时,电感电压的相位超前于电流90度(电流滞后电压...
储急轮18745158654 ______[答案] A