# What is the Ohm in physics?

In the field of physics, the Ohm (often denoted by the symbol ‘Ω’, the capital form of the Greek letter omega) can be defined as the unit of resistance.

Ohm Ω

As per the International System of Units (often abbreviated to SI), one ohm is equal to the electrical resistance between two given points of an electric conductor when a potential difference of 1 volt is constantly maintained across the two points and the resulting current that flows through the conductor has a magnitude of 1 ampere. The SI unit of electrical resistance is named after the German mathematician and physicist Georg Simon Ohm.