diode is a electronic semiconductor device.the first diode is called as cat's whiskers diode,it is developed in the year 1906.which is made up mineral crystals such as galena.generally now a days the diode is made up of semiconductor such as germanium ,silicon etc.
diode is a two terminal electronic semiconductor component .one terminal is cathode and another one is plate.
the common function of diode is used to allow electric current in one direction(forward direction) and also blocks the current flows in the other direction(reverse direction).it is mostly used convert ac(alternating current) to dc(direct current).the unidirectional behaviour of diode is called as rectification.
the another name of semiconductor diode is a schotty diode.
*electronically tune radio and tv reciever is (varactor diode).
*high voltage is protected by the avalanche diode.
*zener diode is used for regulate voltage.
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