题目内容
如图所示,理想变压器原、副线圈匝数比为n1∶n2∶n3=3∶2∶1,副线圈Ⅱ上接有“8 V,8 W”的灯泡L1、L2,副线圈Ⅲ上接有“6 V,9 W”的灯泡L3、L4,当a、b两端接交变电源后,L1、L2正常发光(设所有灯泡的电阻不变),则交变电源的输出功率为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413000444515364.png)
A.24 W |
B.34 W |
C.36 W |
D.72 W |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413000444515364.png)
A
L1、L2正常发光可知副线圈Ⅱ上电压为8V,
,所以副线圈Ⅲ上电压为4V,L3、L4,的电阻
,则实际功率
,则总的输出功率为8×2+4×2=24W,则交变电源的输出功率为24 W,选A
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130004476766.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130004507934.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130004554996.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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