题目内容
阻值R="50" Ω的电热丝接在电压u=100
sin100πt V的交流电源上,电流表的示数为_______ A,电热丝两端电压表的示数为________ V,在前0.005 s内,流过电热丝的平均电流为_________ A.如果将一个电容器接在该交流电源上,要使电容器不被击穿,所选的电容器能承受的最大电压应不小于__________ V.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036265225.gif)
2 100 ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036281234.gif)
100![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036265225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036281234.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036265225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036265225.gif)
A表、V表的读数均为有效值,故
I=
=
R=
A="2" A
U="100" V
=
Im=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036281234.gif)
A.
电容器所能承受的最大电压应不小于交变电压的最大值100
V.
I=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036328397.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036343404.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036359475.gif)
U="100" V
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036374192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036390235.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036281234.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036265225.gif)
电容器所能承受的最大电压应不小于交变电压的最大值100
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114036265225.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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