075含电容器电路的动态分析 精讲精练-2022届高三物理一轮复习疑难突破微专题
075含电容器电路的动态分析一.必备知识1.电容器的简化处理:电路稳定后,简化电路时可以把电容器所处电路作为断路,简化电路时可以将该断路去掉,求电荷量时在相应位置再补上。2.电阻的简化处理:电路稳定后,与电容器同支路的电阻相当于导线。3.电荷变化量的计算:电路中电流、电压的变化可能会引起电容器的充、放电。若电容器两端电压升高,电容器将充电;若电容器两端电压降低,电容器将通过与它连接的电路放电。(1)由ΔQ=CΔU计算电容器上电荷量的变化。(2)如果变化前后极板带电的电性相同,那么通过所连导线的电荷量等于初、末状态电容器所带电荷量之差即|Q1-Q2|。(3)如果变化前后极板带电的电性相反,那么通...
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