Question

what is LED . how it is biased and why​

Answer 1

Answer:

An LED is a light emitting diode. The LED emits light when it is forward biased and it emits no light when it is reverse biased. The intensity of light is proportional to the square of the current flowing through the device. ... Note that LEDs have two leads.

Explanation:

Hope this helps you mate xD

Answer 2

Explanation:

The LED was a forerunner, and a fortuitous byproduct, of the laser development effort. The tiny colored lights held some interest for industry, because they had advantages over light bulbs of a similar size: LEDs use less power, have longer lifetimes, produce little heat, and emit colored light.