题目内容
多用电表指针如下图所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241510481233111.jpg)
(1)如选择开关为“R×10”挡,则所测电阻的阻值![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151048139333.png)
(2)如选择开关为直流电压250V挡,则对应读数是![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151048201316.png)
(3)如选择开关为直流电流100
挡,则对应读数是 ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151048295430.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241510481233111.jpg)
(1)如选择开关为“R×10”挡,则所测电阻的阻值
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151048139333.png)
(2)如选择开关为直流电压250V挡,则对应读数是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151048201316.png)
(3)如选择开关为直流电流100
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151048295430.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151048295430.png)
(1)130 (2)135 (3)54
试题分析:多用电表读数时注意,多用电表最上面一排数据表示测电阻的读数,中间一排是电流和电压读数,读电流、电压时注意量程,读电阻时注意倍率。
(1)所测电阻的阻值为:读数乘以倍率,即
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151048451648.png)
(2)选择开关为直流电压250V挡,读数为对应250量程值,则对应读数是:135V
(3)选择开关为直流电流100
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151048295430.png)
点评:容易题。关键是掌握多用电表的读数方法。
![](http://thumb2018.1010pic.com/images/loading.gif)
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