tell me about power rating and voltage rating of a led ? Answered

Which one?


L

Check the data sheet for the LED or the sellers web site.

An LED is much like any other diode.
http://en.wikipedia.org/wiki/Semiconductor_diode

The characteristic forward voltage drop depends on what material it is made of, and is related to the color of light it emits.
http://en.wikipedia.org/wiki/Light-emitting_diode#Colors_and_materials

The maximum allowable current, or power handling ability, depends on the physical size and construction of the diode junction.
http://en.wikipedia.org/wiki/Light-emitting_diode#Types

20mA @ 1.6V -standard red LED.

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