题目内容
如图所示,是某种正弦式交变电压的波形图,由图可确定该电压的
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242353326183250.jpg)
A.周期是0.01s |
B.最大值是311V |
C.有效值是311V |
D.表达式为U=311sin100πt(V) |
BD
试题分析:从图象可读出电压的最大值、周期,继而求出电压的有效值、角速度,写出电压瞬时值的表达式.由图可知交变电压的周期为T=0.02s,最大值为Um=311V,则有效值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235333195849.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235334552772.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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