题目内容
有关《测定金属电阻率》实验
(1)下列说法正确的有( )
(2)有一金属丝直径测量如图螺旋测微器所示,则其直径为 mm.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241324205514349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132420583378.png)
(3)给定电源电动势3v,电压表0~3v,内阻约10k
,电流表A1 0~0.6A,内阻约0.1
另一电流表A2 ,0~3A,内阻约为0.08
,滑动变阻器R1:0~20
,0.5A,R2:0~2 k
,0.3A,电阻丝阻值R约为8
,则为了较准确地测量电阻丝电阻率,则电流表选 ,滑动变阻器选 画出原理图,标出各元件.
(1)下列说法正确的有( )
A.测量金属丝直径是在不同三处测量后求平均值 |
B.测量金属丝长度时取三个不同长度l1、l2、l3,求平均值![]() |
C.测量电阻用伏安法测量,用电流表内接法时电阻测量值小于真实值 |
D.测量时通电时间不宜太长,电流强度不宜太大 |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241324205514349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132420583378.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132420645379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132420676333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132420676333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132420676333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132420676333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132420676333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132420676333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241324209107326.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241324209415706.png)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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