What is Ohm's law?

Ohm's Law relates the electrical resistance of a conductor to the voltage across it and current passing through it.

The modern form of Ohm's law is V = IR, where V is voltage, I is current, and R is the resistance of the cunductor.

The law was named after the German physicist Georg Ohm who in 1827 made measurements of applied voltage and current through simple electrical circuits containing various lengths of wire.

The most common application of Ohm's law is to circuit elements known as resistors. However, the flow of electricity through many complicated objects or systems can be modled as if the electricity were flowing through simple circuit elements, like resistors. Thus Ohm's law finds wide application in electrical sciences.