What is the SI Unit of Resistance?

SI Unit of Resistance is Ohm (Ω)

The SI unit of resistance is the ohm (Ω), denoted by the Greek letter omega. Resistance, a fundamental property in electrical circuits, opposes the flow of electric current.

The ohm (Ω) is named after the German physicist Georg Simon Ohm, who first formulated Ohm’s Law in the early 19th century. Ohm’s Law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.

One ohm of resistance allows the passage of one ampere of current when a potential difference of one volt is applied across it.

This relationship is described by Ohm’s Law: R=IV​, where R is resistance in ohms, V is voltage in volts, and I is current in amperes.

The ohm serves as a standardised measure of resistance, essential for designing and analysing electrical systems across various fields, from electronics to power distribution.