题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114256853735.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114256868221.gif)
A.开关接通时,交流电压表的读数为220V |
B.开关接通时,交流电压表的读数为![]() |
C.开关断开时,交流电压表的读数为![]() ![]() |
D.开关断开时,交流电压表的读数为![]() ![]() |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241142569465448.jpg)
AD
电压表的读数为交流电的有效值,A项正确。若开关断开,根据交流电有效值的定义:
,故
V,此时功率
,故
,D项正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114256962616.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114256977476.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114256993926.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114257009337.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.开关接通时,交流电压表的读数为220V |
B.开关接通时,交流电压表的读数为![]() |
C.开关断开时,交流电压表的读数为![]() ![]() |
D.开关断开时,交流电压表的读数为![]() ![]() |