题目内容
一个直流电动机的内电阻
,与R=8
的电阻串联接在线圈上,如图所示。已知线圈面积为
m2,共100匝,线圈的电阻为2欧,线圈在
T的匀强磁场中绕O
以转速n=600r/min匀速转动时,在合上开关S后电动机正常工作时,电压表的示数为100V,求电动机正常工作时的输出功率。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411501237424644.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012296387.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012312215.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012327306.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012343409.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012359218.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411501237424644.jpg)
800W
线圈转动时产生的电动势的最大值为:
V,
有效值为:
V。
设线圈的电阻为
,则电路中的电流I为
A,
电动机正常工作时的输出功率为
W。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012405675.gif)
有效值为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012421590.gif)
设线圈的电阻为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012421192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012437576.gif)
电动机正常工作时的输出功率为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012452559.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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