题目内容
如图所示的U~I图线中,Ⅰ是电源的路端电压随电流变化的图线,Ⅱ是某电阻两端的电压随电流变化的图线,用该电源向该电阻供电时电阻上消耗的功率和电源的电动势
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250038236543006.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250038236543006.jpg)
A.4W和2V | B.2W和3V |
C.2W和2V | D.4W和3V |
D
试题分析:根据闭合电路欧姆定律U=E-Ir可知,当I=0时,U=E,则由图线Ⅰ与纵轴交点读出电源的电势为E=3V,其斜率等于电源的内阻r=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003823669526.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003823685404.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003823700539.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目