LED

LED stands for light emitting diode.

It is a type of diode that emitsĀ  light.

Note that one wire is longer than the other one (indicating the positive side) and there is also a flat spot on the light (showing the negative side of the terminal).

This indicates the way that the diode should be positioned and the way electricity should flow.

Wikipedia, Inductiveload, public domain
Wikipedia, Inductiveload, public domain

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