题目内容
(13分)在“测量电源的电动势和内阻”的实验中,待测电源是两节干电池,图甲给出了实验电路图,图乙已按电路图将器材部分连线。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415433583211656.jpg)
(1)请将乙图中的器材连线补充完整(在答题卡的图中完成)。
(2)设电源电动势为
,内阻为
,则路端电压
和闭合电路的电流
的关系可以表达为 。
(3)实验测出了六组
、
值,并在
-
坐标上描绘出如图丙所示的图线,根据图线可以算出电源的电动势为 V,内阻为 Ω。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415433583211656.jpg)
(1)请将乙图中的器材连线补充完整(在答题卡的图中完成)。
(2)设电源电动势为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154335942318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336035260.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336176321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336332265.png)
(3)实验测出了六组
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336176321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336332265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336176321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336332265.png)
(1)如图所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241543368007842.jpg)
(2)
(3)2.9、1.61(1.60-1.64都对)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241543368007842.jpg)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336893566.png)
试题分析:设电源电动势为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154335942318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336035260.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336176321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336332265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154336893566.png)
点评:理解实验原理是解决实验题目的关键。
![](http://thumb2018.1010pic.com/images/loading.gif)
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