题目内容
(10分)如图所示,线段A为某电源的U-I图线,线段B为某电阻R的U-I图线,由上述电源和电阻组成闭合电路时,请根据题意以及图像求出下列物理量:电源电动势E、电源内阻r、电阻R、电源的输出功率
、电源内部损耗的电功率
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241449139922207.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144913758379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144913945391.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241449139922207.jpg)
E=3V r=0.5Ω R=1Ω
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144914054610.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144914007577.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144914054610.png)
试题分析:根据题意,从图线A可读出:
E=3V(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144914132883.png)
从图线B可得出 :
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144914257798.png)
由闭合电路欧姆定律得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144914475773.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144914678747.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144915006761.png)
注:此题方法较多,方法正确即可得分,给分原则为每个所求量2分。
点评:中等难度。闭合电路欧姆定律的应用计算通常有两种方法:一是充分利用题目的已知条件,结合欧姆定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144915068610.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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