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LED怎样看出正负极
更新时间： 2020-09-20 00:00:00  

1、对于普通二极管，可以看管体表面，有白线的一端为负极;

2、对于发光二极管，引脚长的为正极，短的为负极;

3、如果引脚一样长，发光二极管管体内部金属极较小的为正极，大的片状的为负极；

4、或者可打开万用表，将旋钮拨到通断档，将红黑表笔分别接在两个引脚。若有读数，则红表笔一端为正极；若读数为“1”，则黑表笔一端为正极。

关键词： led 怎样 看出 负极

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