LED tutorial: "shorter anode pin should be connected to positive". Eh?! WTF? - General Electronics - Arduino Forum
Identify led positive and negative terminals - electronics #3 - YouTube
3mm LED Technical Specifications and Power Characteristics
How to connect 2 or 3 LEDs to the battery? - elektroda.com
Zjistit plus s minus
Defective bulbs. Close-up of an exploded led lamp with burn marks on the plus and minus connecting wires isolated on a white background. Clipping path Stock Photo - Alamy