题目内容
如图13-1-21所示,正弦波甲和方波乙的交变电流的峰值和频率相同,把此两电流通入阻值完全相同的电阻,则在相同的时间里(足够长)两电阻所消耗的电功之比W甲∶W乙为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206397943321.jpg)
图13-1-21
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206397943321.jpg)
图13-1-21
A.1∶2 | B.1∶2 | C.1∶1 | D.1∶4 |
A
交变电流甲的有效值
;交变电流乙的有效值I乙=Im.所以![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206398401127.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120639825457.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206398401127.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容
A.1∶2 | B.1∶2 | C.1∶1 | D.1∶4 |