题目内容
如下图所示,直线b为电源的U-I图像,直线a为电阻R的U-I图像,用该电源和该电阻组成闭合电路时,电源的输出功率和电源的效率分别( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019151482579.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019151482579.png)
A.电源的输出功率为4W |
B.电源的输出功率为2W |
C.电源的效率为33.3% |
D.电源的效率为67% |
AD
试题分析:由a图线得到,电阻R=1Ω,由b图线得到,电源的电动势为E=3V,短路电流为I短=6A,内阻为r=0.5Ω,用该电源和该电阻组成闭合电路时,电路中电流为I=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001915164540.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001915180510.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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