题目内容
一正弦交流电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/20140825/201408250000039763504.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000039763504.jpg)
A.该交流电的电压瞬时值的表达式为u=100 sin(25t)V |
B.该交流电的频率为50 Hz |
C.该交流电的电压的有效值为100![]() |
D.若将该交流电压加在阻值R=100 Ω的电阻两端,则电阻消耗的功率为50 W |
D
试题分析:由题图可知,T=4×10-2s,故f=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000004100348.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000004116531.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000004132481.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000004085344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000004163502.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000004178461.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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