Diode

fig; symbol of diode

A diode is a  electronic component having two terminal and of low resistance that conducts current in single direction.But it have opposite nature to opposite direction i.e high  resistance in the another direction. A semiconductor diode, the most common type diode which are mostly used in our daily life equipment.It is a crystalline piece of semiconductor material with a p–n junction connected to two electrical terminals.

Diode are mostly made up of silicon and germanium.

There are many type of diode some common diode which are used in our daily life are 

1)PN junction diode

2)Zener diode

3)Tunnel diode

4)Schottky diode

5)Varacfor diode

1)PN junction diode

When p type of semiconductor is join with a n type of semiconductor so as to form one piece ther assemble so obtain known as p-n junction diode or simply junction diode. Holes are the majority charge carrier and electron are the minority charge carrier in p type of crystal and simirally in n-type of crystal the electron are majority charge carrier and holees are minority charge carrier.

 2)Zener diode

It is a reverse bias strongly doped silicon or germanium p-n junction diode which is used in the breakdown rregion where current is limited by for external resistance and dispassion of diode. Its is mainly used in breakdown region in reverse bias condition so that its also known as breakdown diode.