题目内容
理想变压器的原副线圈匝数之比为4:1,若在原线圈上加u=1410Sin100t(V)的交变电压,则在副线圈两端用理想交变电压表测得的电压是:
A.250V | B.352.5V | C.203.8V | D.327.5V |
A
试题分析:原线圈两端的有效电压值为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155740855885.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155740995638.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155741167961.png)
故选A,
点评:基础题,关键是会根据表达式求解有效值,然后根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155740995638.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.250V | B.352.5V | C.203.8V | D.327.5V |