题目内容
有一灯泡上标有“6V 0.1A”的字样,现要测量该灯泡的伏安特性曲线,有下列器材供选用:
A.电压表(0-5V,内阻2.0K
)
B.电压表(0-10V,内阻3.0K
)
C.电流表(0-0.3A,内阻2.0
)
D.电流表(0-6A,内阻1.5
)
E.滑动变阻器(30
,2A)
F.滑动变阻器(100
,0.5A)
G.学生电源(直流9V)及开关、导线等
(1)实验中所用的电压表应选________,电流表应选________,滑动变阻器应选______。
(2)画出实验电路图,要求电压从0V开始测量。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155524417507.png)
A.电压表(0-5V,内阻2.0K
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155523668301.png)
B.电压表(0-10V,内阻3.0K
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155523668301.png)
C.电流表(0-0.3A,内阻2.0
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155523668301.png)
D.电流表(0-6A,内阻1.5
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155523668301.png)
E.滑动变阻器(30
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155523668301.png)
F.滑动变阻器(100
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155523668301.png)
G.学生电源(直流9V)及开关、导线等
(1)实验中所用的电压表应选________,电流表应选________,滑动变阻器应选______。
(2)画出实验电路图,要求电压从0V开始测量。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155524417507.png)
(1) B;C;E
(2)实验电路如下图:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241555246984330.png)
(2)实验电路如下图:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241555246984330.png)
试题分析:(1)灯泡上标有“6V 0.1A”的字样,为了测量全部数据,所以电压表应选B;灯泡的额定电流为0.1A,为了尽可能的减小误差,电流表应选C;本实验采用分压电路,滑动变阻器越小越好,应选E.
(2)本实验要求电压从0V开始测量,所以选用分压电路,灯泡电阻
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155524900796.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241555246984330.png)
点评:测量电路的选择:当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155525228653.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155525400659.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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