Georg Simon Ohm (, German: ['ge???k '?o?m]; 16 March 1789 – 6 July 1854) was a German physicist and mathematician.
As a school teacher, Ohm began his research with the new electrochemical cell, invented by Italian scientist Alessandro Volta.
Using equipment of his own creation, Ohm found that there is a direct proportionality between the potential difference (voltage) applied across a conductor and the resultant electric current.