Electrical Noise
any unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals.
Classification
Based on Origin
1. External noise
a) Atmospheric
b) Extra-terrestrial
i. solar
ii. Cosmic
c) Industrial
2. Internal noise
a) Thermal Agitation Noise
b) Shot Noise
c) Transit Time Noise
d) Flicker Noise
e) Miscellaneous Sources
Thermal noise
Thermal Agitation Noise
Also known as Johnson noise or White noise .
Shot Noise
