what is LED??? mention two advantages of LED over conventional lamps.
Alight-emitting diode(LED) is asemiconductorlight source.When a light-emitting diode is switched on,electronsare able to recombine withholeswithin the device, releasing energy in the form ofphotons. This effect is calledelectroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energyband gapof the semiconductor.
LEDs have many advantages over incandescent light(conventional lamps) sources including
- lower energy consumption
- longer lifetime
- improved physical robustness
- smaller size
- faster switching.