Which unit of measurement is used to measure resistance in an electrical circuit?

Resistance in an electrical circuit is measured in ohms, which is the standard unit of measurement for this property. The concept of resistance pertains to how much a material opposes the flow of electric current. It is a fundamental aspect of Ohm's Law, which states that voltage equals current times resistance (V = I × R). Thus, ohms provide a direct measure of how much resistance is present in a circuit; the higher the resistance, the less current will flow at a given voltage.

Other options refer to different electrical concepts: an ohmmeter is a device used to measure resistance, while a watt measures power, and an ammeter measures current. These terms are related to working with electrical circuits, but only ohm is specifically designated for measuring resistance.