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How to recognize positive terminal of LED if both terminal are same in length

Arduino Electronic-components-and-connections 00-01 min 10-20 sec 01-06-20, 10:13 a.m. rjangir

Answers:

If both the terminal of the same length and you are not able to identify the positive terminal, just connect a digital multimeter in Diode testing mode to test LED glow, or if you don't have a digital multimeter and if you can see internal leads of an LED you can identify as shown in the attached figure.

<img align="none" alt="LED internal" src="https://allabouteng.com/wp-content/uploads/2018/07/LED-terminals-identification.png">

<img align="none" alt="LED with multimeter" src="https://allabouteng.com/wp-content/uploads/2018/07/LED-Test-using-multimeter.png">

01-06-20, 1:10 p.m. rajeshmk
Without multimeter how can we identify positive and negative terminal of LED
01-06-20, 1:45 p.m. rjangir
I have an answer for both how to identify terminal with and without a multimeter. Just check the diagram showing the internal leads of the LED.
01-06-20, 1:53 p.m. rajeshmk
Sir can we find out the terminal of LED with chamfered edge. Chamfered edge terminal known an positive and rest is negative. m i right?
01-06-20, 1:58 p.m. rjangir
Yes, Chamfered edge is a positive terminal and the flat edge is negative terminal.
01-06-20, 2:05 p.m. rajeshmk

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