题目内容
一理想变压器原、副线圈的匝数比n1 : n2="2" : 1,原线圈两端接一正弦式交变电流,其电压u随时间t变化的规律如图所示,则副线圈两端电压的有效值和频率分别为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242256299563361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242256299563361.png)
A.110V,50Hz | B.110V,0.5Hz | C.220V,50Hz | D.220V,0.5Hz |
A
试题分析:变压器初级电压有效值为U1=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242256310011060.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225632436668.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225633310468.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225634371628.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225633310468.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824225632436668.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.110V,50Hz | B.110V,0.5Hz | C.220V,50Hz | D.220V,0.5Hz |