题目内容
某小型发电机产生的交变电动势为e=50 sin 100πt(V).对此电动势,下列表述正确的有 ( ).
A.最大值是50![]() | B.频率是100 Hz |
C.有效值是25![]() | D.周期是0.02 s |
CD
试题分析:从中性面开始计时,交变电动势的表达式为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213108249673.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213109356941.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213110573599.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213111447692.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213112648511.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213113896611.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213106517344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213115768468.png)
故选CD
点评:关键是对公式的灵活掌握,基础题,比较简单
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容
A.最大值是50![]() | B.频率是100 Hz |
C.有效值是25![]() | D.周期是0.02 s |