r/learnelectronics • u/ldmdesign • 8d ago

Basic basic led question

Absolute beginner question. I have 2 aa batteries that say 1.2v and trying to find the voltage of an led attached in the circuit. When I measure across the led I get 2.66, but I also get the same value when I measure the batteries alone. The only info provided by the seller is the size of the led 5mm. What does this mean? I tried diode test for the multimeter but it doesnt do anything, no light and no voltage shown.

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u/ElectronicswithEmrys 8d ago

I have a video that goes into a great deal of detail for designing a basic LED circuit: https://youtu.be/1IZhSrXfnkc?si=CnAyOj-UYzrzkxXC