题目内容
(10分)如图所示的电路中,
,
,
,电源电动势E=24V,内阻不计,当开关
、
均开启和闭合时,灯泡L均正常发光。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014596202603.png)
(1)写出两种情况下流经灯泡的电流方向:
、
均开启时;
、
均闭合时.
(2)求灯泡正常发光时的电阻
和电压
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459526533.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459542538.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459573553.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459589349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459604383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014596202603.png)
(1)写出两种情况下流经灯泡的电流方向:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459667298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459682335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459667298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459682335.png)
(2)求灯泡正常发光时的电阻
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459745303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459760321.png)
(1)当
、
均开启时,电流由
;当
、
均闭合时,电流由![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459948424.png)
(2)
,![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459994570.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459667298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459682335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459885422.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459667298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459682335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459948424.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459963496.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459994570.png)
试题分析: (1) 当
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459667298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459682335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459885422.png)
当
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459667298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459682335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459948424.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015001195920.jpg)
(2)当
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459667298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459682335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001500166882.png)
当
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459667298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459682335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001500228799.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001500244662.png)
联立上述各式代入数据得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459963496.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001459994570.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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