What is the unit of electrical resistance?

The unit of electrical resistance is the ohm. This unit measures how much a material opposes the flow of electric current. When an electrical circuit operates, the ohm quantifies the resistance that the current encounters as it passes through various components. Specifically, one ohm is defined as the resistance that allows one volt to produce one ampere of current. This relationship is described by Ohm's Law, which is a fundamental principle in electrical engineering and physics.

In contrast, a volt measures electrical potential energy per unit charge, an ampere measures the flow of electric charge, and a watt quantifies electrical power consumed or produced. Each of these units serves a different purpose in describing various aspects of electrical circuits, whereas the ohm specifically defines the resistance within those circuits.