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230问答网 > 用试触法怎样判断电流表是外接还是内接？

用试触法怎样判断电流表是外接还是内接？

2025-03-21 12:28:28

推荐回答（2个）

回答1：

试触法：若电压表变化明显，说明待测电阻和电流表内阻差不多，误差较大，采用外接法
若电流表变化明显，说明待测电阻和电压表内阻差不多，误差较大，采用内接法
自己体会懂了，就知道该内接还是外接。

回答2：

记住“内大外小”即可
具体含义：
内大~内接法适合测大电阻测量值大于真实值
外小~外接法适合测小电阻测量值小于真实值

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