电容通常就是指电容器,是2个相互接近的导体,里面夹一层不导电的绝缘介质,这就组成了电容器。当电容器的2个极板相互间加上电压时,电容器便会储存电荷。电容器的电容量在数值上等于一个导电极板上的电荷量与2个极板相互间的电压之比。
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