题目内容
某电路两端交流电压u=Umsin100πt(V),在t=0.005s时刻,电压u值为10V。接在此电路两端的电压表示数为___ ___V。如将阻值为R的电阻接在此交流电压上时电阻消耗的功率为P;而改接在电压为U0的直流电压上时功率为P/4,则U0=____ ___V。(结果保留三位有效数字)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002649608566.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002649624657.png)
试题分析:在t=0.005s时刻,电压u值为10V,所以Um="10V," 电路两端的电压
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026496551080.png)
根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002649671606.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002649702840.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002649733850.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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