题目内容
如图所示的电路中,当a、b端加直流电压时,
灯发光,
灯不亮,当加同样电压的交流电源时,
发光但较暗,
灯发光较亮,那么以下正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143233732215.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114323326206.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114323326213.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114323326206.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114323326213.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143233732215.jpg)
A.A中接的是电感线圈,B中接的是电容器 |
B.A中接的是电容器,B中接的是电感线圈 |
C.A中接的是电阻,B中接的是电容器 |
D.若加的交流电频率增大,电压不变,则![]() ![]() |
AD
电感的特点是"通直流、阻交流,通低频、阻高频"。电容的特点是:"通交流、隔直流,通高频、阻低频"。由题意:a、b两端加直流电压时,
灯不亮;加交流电压时,
较亮,可知B为电容器,而
灯先是亮的,后又较暗,可知A为电感线圈。交流电频率越大时,线圈感抗越大,电容器容抗越小,故D为正确。应选A、D。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114323326213.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114323326213.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114323326206.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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