How to determine the polarity of the led without multimeter or battery

How to determine the polarity of the led without multimeter or battery

A very basic question which I came across in my previous experience while teaching is that, how do you determine the polarity of the LED without any multimeter or powering it up with a battery. There are three methods to determine the polarity of the LED. In this video, I have explained all three of them:

It is a simple hack to increase your productivity while working on breadboard or soldering something. Often we solder it reverse or place it reverse. I hope this tutorial helps you to understand to distinguish the polarity of the led

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