What is the measurement of resistance in an electrical circuit expressed in?

Resistance in an electrical circuit is measured in ohms. This unit is named after the German physicist Georg Simon Ohm, who formulated Ohm's Law, which relates voltage, current, and resistance in an electrical circuit. According to this law, resistance can be defined as the ratio of voltage (in volts) to current (in amperes).

Ohms are used to quantify how much a material resists the flow of electric current, impacting how electrical systems are designed and analyzed. This measurement is crucial for understanding circuit behavior, ensuring components operate safely within their specified limits.

Other units such as volts, amperes, and watts represent different electrical concepts—volts measure electrical potential, amperes measure current, and watts measure power. Thus, within the context of the question, ohms is the only appropriate unit for measuring resistance.