Question

What is LED?????????​

Answer 1

$\huge\mathfrak\red{Answer}$

In the simplest terms, a light-emitting diode (LED) is a semiconductor device that emits light when an electric current is passed through it. Light is produced when the particles that carry the current (known as electrons and holes) combine together within the semiconductor material.

Answer 2

Answer:

LED(light emitting diodes) can be used in place of the electric bulb in the tester , LED glows even when a weak electric current flown through it.