Answer / pooja

LED is a semiconductor device.LED's are used as indicating lamps in many devices.When LED is forward biased electrons are able to recombine with electron holes with in the device releasing energy in the form of Photons & this is known as Electroluminescene & colour of LED is determined by Energy gap of the Semiconductor.

Answer / pinkal_ec

LED's are special diodes that emit light when connected in a circuit. They are frequently used as "pilot"
lights in electronic appliances to indicate whether the circuit is closed or not. A a clear (or often colored)
epoxy case enclosed the heart of an LED, the semi-conductor chip.

Answer / learn basic electronics

Led mean Light Emitting Diode .
Led lighting when connected with measured voltage.
It's using on indicators electronics torch light.
it is using for signal on television and many other devices.
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http://learnelectronicshelp.blogspot.com/

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