题目内容
例12、图16中E=10V,R1=4Ω,R2=6Ω,C=30μF,电池内阻可忽略.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158241811600.gif)
(1)闭合电键K,求稳定后通过R1的电流.
(2)然后将电键K断开,求这以后流过R1的总电量.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158241811600.gif)
(1)闭合电键K,求稳定后通过R1的电流.
(2)然后将电键K断开,求这以后流过R1的总电量.
(1)1.8
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115824446685.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115824415303.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115824446685.gif)
(1)闭合电键K,稳定后通过R1的电流为:
,
电容器上电压为IR2,储存的电量为 Q1=CIR2=1.8
(2) 电键K断开后,待稳定后,电容器上电压为E,储存的电量为:
Q2=CE=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115824524435.gif)
流过R1的总电量为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115824446685.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115824477583.gif)
电容器上电压为IR2,储存的电量为 Q1=CIR2=1.8
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115824415303.gif)
(2) 电键K断开后,待稳定后,电容器上电压为E,储存的电量为:
Q2=CE=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115824524435.gif)
流过R1的总电量为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115824446685.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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