题目内容
.一正弦式电流的电压随时间变化的规律如图所示.由图可知 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252476603803.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252476603803.jpg)
A.该交变电流的电压瞬时值的表达式为u=100sin(25t)V |
B.该交变电流的频率为25 Hz |
C.该交变电流的电压的有效值为100 V |
D.若将该交流电压加在阻值为R=100 Ω的电阻两端,则电阻消耗的功率是50 W |
BD
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412524797212788.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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