# Physics - What is Ohm's Law?

**Ohm's Law**

At constant temperature, the current passing through a conductor is proportional to the potential difference between its ends.

If the potential difference between the ends of a Conductor AB is V and the current through it is ** i**, then according to

**Ohm's Law,**

where R is a constant known as Electrical Resistance of the Conductor.

**Limitations of Ohm's Law**

** Ohm's law** is applicable to metal conductors when physical constants dimensions and temperature are constant.

The Conductors that obey ohm's law are called *ohmic registors.*

E.g Metals