题目内容
(本题12分)在“测定金属电阻率”的实验中,某同学进行了如下测量:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321475002379.png)
(1)用刻度尺测量被测电阻丝的有效长度,如图所示,金属丝的另一端与刻度尺的零刻度对齐,读数为 cm。用螺旋测微器测金属丝直径,结果如图所示,读数为 mm。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132147546661.png)
(2)电压表、电流表读数如右图,则U= ,I= 。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321475623698.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321476093648.png)
(3)根据电路图给实物图连线
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321477022076.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413214790524556.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321475002379.png)
(1)用刻度尺测量被测电阻丝的有效长度,如图所示,金属丝的另一端与刻度尺的零刻度对齐,读数为 cm。用螺旋测微器测金属丝直径,结果如图所示,读数为 mm。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132147546661.png)
(2)电压表、电流表读数如右图,则U= ,I= 。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321475623698.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321476093648.png)
(3)根据电路图给实物图连线
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321477022076.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413214790524556.png)
(1)24.00 0.600 (2)2.40V 0.31A
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413214815552218.png)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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