题目内容
如图8所示,是某种正弦式交变电压的波形图,由图象可确定该电压的( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400229655867.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400229655867.png)
A.周期是0.01 s |
B.最大值是311 V |
C.有效值是220 V |
D.表达式为u=220sin 100πt (V) |
BC
由图可知周期为0.02s,A错;峰值为311V,B对;有效值为
,C对;表达式为
,D错;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140023012800.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400230581077.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.周期是0.01 s |
B.最大值是311 V |
C.有效值是220 V |
D.表达式为u=220sin 100πt (V) |