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灯泡正负极怎么分
更新时间: 2020-11-08 00:00:00  

家用的普通灯泡是交流供电的,不分正负极性的。如果LED灯,分辨它的正负极方法如下:

1,新买LED没有剪过脚的,长脚是正极。

2,用一节1.5V电池接LED如果亮就是电池正接对LED正。

3,用万用表电阻档或二极管档,如果亮,红表笔接对了LED正极。

关键词: 灯泡 负极 怎么

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