题目内容
如图3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/20140824/2014082414225324113242.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414225324113242.png)
A.最大值是311V |
B.有效值是220V |
C.周期是0.01s |
D.表达式为U=220sin100πt(V) |
AB
由图像可知电压的峰值为311V,有效值为
,AB对;周期为0.02s,根据交变电压瞬时值表达式为
,CD错;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142253334789.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241422533971077.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.最大值是311V |
B.有效值是220V |
C.周期是0.01s |
D.表达式为U=220sin100πt(V) |