题目内容
如图,A为电源的U—I图线,B为电阻R的U—I图线,用该电源和该电阻组成闭合电路时,电源的输出功率为 ,电源的效率为 ,电源内阻消耗的功率为 ,外电阻和内阻之比为 。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241535368802444.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241535368802444.jpg)
4W 、 67% 、 2W 、 2 :1
试题分析:电源的输出功率为电阻的电功率
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153537052783.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153537146958.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241535372081222.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153537380585.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153537629817.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241535378161129.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153537957644.png)
点评:学生清楚两图线的交点为电路中通过的电流和外电路两端的电压,能看懂图像是解题的关键。
![](http://thumb2018.1010pic.com/images/loading.gif)
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