题目内容
某交流电动势的瞬时值e=Emsinωt,若将转速提高1倍,其他条件不变,则其电动势的瞬时值为
A.Emsin2ωt | B.Emsinωt | C.2Emsintω | D.2Emsin2ωt |
D
试题分析:根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161556694561.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161556850669.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161557100762.png)
故选D
点评:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161557365734.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161557505414.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161557755308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824161558036732.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.Emsin2ωt | B.Emsinωt | C.2Emsintω | D.2Emsin2ωt |