066电容器的充电与放电实验 精讲精练-2022届高三物理一轮复习疑难突破微专题
066电容器的充电与放电及其实验 一.必备知识1.电容器的组成:由两个彼此绝缘又相距很近的导体组成。最简单的电容器是平行板电容器。2.电容器的充电、放电①充电:两极板的电荷量增加,极板间的电场强度增大,电源的能量不断储存在电容器中。②放电:电容器把储存的能量通过电流做功转化为电路中其他形式的能量。③充电时电流流入正极板,放电时电流流出正极板。3.电容(1)定义:电容器所带的电荷量Q与电容器两极板之间的电势差U之比,叫作电容器的电容。其中“电容器所带的电荷量Q”,是指一个极板所带电荷量的绝对值。(2)定义式:C=。推论:C=。(3)单位:法拉(F),1F=106μF=1012pF。(4)物理意义...
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