The most common function of a pn junction diode is to allow an electric current to pass in one direction (called the diode’s forward bias), while blocking the current in the opposite direction (the reverse direction).
SYMBOL PN JUNCTION DIODE
It has two terminals one is anode (+) and other is cathode (–).
Diode in forward bias: Connect positive terminal of battery to anode (+) of diode and negative terminal to cathode (–) of diode.
PN DIODE VI CHARACTERISTICS
[V (voltage) and I (current)]
APPLICATION OF DIODE
- We can use it as an electronic switch/button, which starts working when a signal presents.
- Secondly we can use diodes to protect our circuit from back EMF of a circuit.
- Diode is also used for rectification
Diodes are made up of silicon, germanium etc. semiconductor material.
LED – LIGHT EMITTING DIODE