题目内容
图是一正弦交变式电流的电压图象。则此正弦交变式电流的频率和电压的有效值分别为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241420526216092.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241420526216092.jpg)
A.50Hz,220V | B.50Hz,220![]() | C.0.5Hz,220![]() | D.0.5Hz,220V |
A
由波形图可知周期为0.02s,频率为1/T=50Hz,峰值为220
,有效值为220V,A对;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142052715443.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.50Hz,220V | B.50Hz,220![]() | C.0.5Hz,220![]() | D.0.5Hz,220V |