题目内容
(1)某同学用刻度尺测金属丝的长度l,用螺旋测微器测金属丝的直径d,其示数分别如图1和图2所示,则金属丝长度l=______cm,金属丝直径d=______mm.他还用多用电表按正确的操作程序测出了它的阻值,测量时选用“×1”欧姆挡,示数如图3所示,则金属丝的电阻R=______Ω.
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/2014061023100605533687.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/2014061023100605533687.png)
刻度尺的读数为:40.25cm,
螺旋测微器的固定刻度读数为0mm,可动刻度读数为0.01×22.9mm=0.229mm,所以最终读数为0.229mm.
被测电阻的阻值为9×1=9Ω
故答案为:40.25,0.229mm,9Ω.
螺旋测微器的固定刻度读数为0mm,可动刻度读数为0.01×22.9mm=0.229mm,所以最终读数为0.229mm.
被测电阻的阻值为9×1=9Ω
故答案为:40.25,0.229mm,9Ω.
![](http://thumb2018.1010pic.com/images/loading.gif)
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