Ohm's law

This article is about the law related to electricity. For other uses, see Ohm's acoustic law.
A voltage source, V, drives an electric current, I, through resistor, R, the three quantities obeying Ohm's law: I = V/R.Ohm's law applies to electrical circuits; it states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them.

The mathematical equation that describes this relationship is:


where I is the current