What is light emitting diode (LED)?

What is lighting?

What the help of a diagram, show that biasing of a light emitting diode (LED). Give its two advantages over conventional incandescent lamps.

Distinguish between the light emitting diode and photo diode.

What do you mean by light emitteing diodes? Why are they so called? State applications of LEDs. Why we prefer LEDs over conventional incandescent lamps?

What is LED?

Explain, with the help of a schematic diagram, the principle and working of a Light Emiting Diode. What criterion is kept in mind while choosing the semiconductor material for such a device ? Write any two advantages of light emiting diode over conventional incandescent lamps.