2个相互靠近的导体,里面夹着一层不导电的绝缘介质,这就组成了电容器。当电容器的2个极板之间加上电压时,电容器便会储存电荷。电容器的电容量在数值上相当于一个导电极板上的电荷量与2个极板之间的电压之比。电容器的电容量的基本单位是法拉(F)。在电路图中一般用字母C表示电容元件。
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