什么是交流电和直流电？ - 知乎
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1、直流电（Direct Current,简称DC） 直流电是指方向始终固定不变的电压或电流。能产生直流电的电源称为直流电源，常见的干电池、蓄电池和直流发电机等都是直流电源，直流电源常用图1-19 (a)所示的图形符号表示。直流电的电流方向总是由电源正极流出，再通过电路流到负极。在图1-19 (b)所示的直流 ...
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