Resistance (R) is measured in what unit?

Resistance is measured in ohms, which is the correct answer. The ohm is the standard unit of measurement for electrical resistance in the International System of Units (SI). It quantifies how much a component resists the flow of electric current. One ohm is defined as the resistance that occurs when one volt of electrical potential causes a current of one ampere to flow through a conductor.

Understanding electrical units is crucial in various applications, including electrical engineering and technology. In this context, volts refer to electrical potential, amps are a measurement of current, and watts measure power—each playing its own distinct role in electrical systems. However, resistance specifically pertains to how much a substance impedes current, and thus is measured exclusively in ohms.