题目内容
把两根电阻相同的电热丝先串联后并联分别接在同一理想电源上,若要产生相等的热量,则两种方法所需的时间之比t串:t并为
A.1:1 | B.2:1 | C.4:1 | D.1:4 |
C
试题分析:由串并联电路的特点可知,串联后总电阻为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153746080507.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153746189583.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153746314685.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241537463921259.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153746439581.png)
故选C
点评:注意接在同一理想电源上,电阻两端的电压相同,产生的电热与电阻成反比。
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.1:1 | B.2:1 | C.4:1 | D.1:4 |