题目内容
两个相同的电阻,分别通以如图所示的正弦交变电流和方波形交变电流,两种交变电流的最大值相等,周期相等.则在一个周期内,正弦式交流电在电阻上产生的焦耳热
与方波式交流电在电阻上产生的焦耳热
之比等于( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143221252026.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114322094228.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114322109232.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143221252026.jpg)
A.3:1 | B.1:2 | C.2:1 | D.4:3 |
B
由正弦交变电流的有效值
,此方波形交变电流的有效值
,因此
,故正确答案选B。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114322156464.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114322172372.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143221871152.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.3:1 | B.1:2 | C.2:1 | D.4:3 |