Resistance in an electrical circuit is measured in which unit?

Resistance in an electrical circuit is measured in ohms. The ohm is the standard unit of measure for electrical resistance, named after the German physicist Georg Simon Ohm. In an electrical context, resistance refers to the opposition that a substance offers to the flow of electric current. The relationship between voltage (measured in volts), current (measured in amperes), and resistance is described by Ohm's Law, which states that voltage equals current multiplied by resistance (V = I x R).

Understanding the role of resistance is crucial in circuit design and analysis, as it affects how much current can flow for a given voltage. The other units listed—watts, volts, and amperes—each measure different electrical properties: watts measure power, volts measure electrical potential, and amperes measure current. Therefore, the unit specifically used for resistance is indeed ohms.