Which unit is used to measure electrical resistance?

The unit used to measure electrical resistance is ohm. The ohm is defined as the resistance between two points in a conductor when a constant potential difference of one volt applied between those points produces a current of one ampere. This relationship is described by Ohm's Law, which states that voltage equals current multiplied by resistance (V = IR). Understanding this fundamental concept is crucial in electronics and electrical engineering, as it helps in analyzing and designing circuits according to how components resist electrical flow.

In contrast, volt is the unit of electric potential, watt measures electrical power, and ampere is the unit of electric current. Each of these units plays a different role in electrical systems but does not quantify resistance directly.