What is Ohm's Law?

By: Dusty Arlia
Published on December 29, 2011
Last Updated on Saturday, July 18, 2015 at 6:22 PM
Total Updates: 3

Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship.

I = V / R

This is also equivalent to:

V = I x R


R = V / I


I = amperes = current
V = volts = potential difference measured across the conductor
R = ohms = resistance of the conductor