题目内容
如图是一个正弦式电流的图象,下列说法正确是的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102220371515990.png)
A.周期是0.2s,电流的峰值是10A |
B.周期是0.15s,电流的峰值是10A |
C.频率是5HZ,电流的有效值是10A |
D.频率是0.2HZ,电流的有效值是7.07A |
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102220371515990.png)
AB、由图象知周期是T=0.2s,电流的峰值是Im=10A,A正确,B错误;
CD、频率是f=
=5Hz,电流有效值为
=5
A=7.07A,CD错误;
故选:A.
CD、频率是f=
1 |
T |
10 | ||
|
2 |
故选:A.
![](http://thumb2018.1010pic.com/images/loading.gif)
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