题目内容
将阻值为4
的电阻接到内阻不计的交流电源上,该电源电动势e随时间t变化的规律如图所示,下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040070974526.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004007082333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040070974526.png)
A.电路中交变电流的频率为2.5Hz |
B.通过电阻的电流为![]() |
C.电阻消耗的电功率为2W |
D.电阻两端的电压是4V |
AC
试题分析:由图知,交流电的周期为0.4s,所以频率等于周期的倒数2.5He,故A正确;电动势的有效值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004007144477.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004007160795.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004007160714.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004007144477.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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