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12v电源适配器如何区分正负极

更新时间: 2020-09-21 00:00:00     

1、用万用表的电压档进行测量即可,表针正偏时,红表笔接触的是电源正极;

2、用发光二极管串联一个较大的电阻进行测量即可,二极管发光,则可以判断与电阻正极接触的接触端是电源正极;

3、将一节电池和该电源适配器分别接上小电机进行测量即可,分开查看小电机的转动方向,方向一致时,电池的正负极刚好对应的是电源的正负极。

关键词: 12v 电源 配器 如何 区分 负极

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