In an electrical circuit, what is the unit of resistance?

Resistance in an electrical circuit is measured in ohms, which is the standard unit for quantifying how much a material opposes the flow of electric current. The concept of resistance comes from Ohm's Law, which states that voltage (measured in volts) is equal to the current (measured in amperes, or amps) multiplied by the resistance (measured in ohms). This relationship allows us to understand how resistive materials will affect the flow of electricity in a circuit.

The other options are units of measurement for different electrical concepts: volts measure electrical potential, amps measure the flow of electric current, and watts represent power, which is derived from the product of current and voltage. Recognizing that ohms are specifically used for resistance helps clarify the fundamental principles governing electrical circuits and their components.