第七章 第3讲 电容器 带电粒子在电场中的运动
第3讲 电容器 带电粒子在电场中的运动一、电容器及电容1.电容器(1)组成:由两个彼此绝缘又相互靠近的导体组成.(2)带电荷量:一个极板所带电荷量的绝对值.(3)电容器的充、放电:①充电:使电容器带电的过程,充电后电容器两极板带上等量的异种电荷,电容器中储存电场能.②放电:使充电后的电容器失去电荷的过程,放电过程中电场能转化为其他形式的能.2.电容(1)定义:电容器所带的电荷量与电容器两极板间的电势差的比值.(2)定义式:C=.(3)单位:法拉(F)、微法(μF)、皮法(pF).1F=106μF=1012pF.(4)意义:表示电容器容纳电荷本领的高低.(5)决定因素:由电容器本身物理条件(大小...
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