What measurement unit is used to express electrical resistance?

The measurement unit used to express electrical resistance is the Ohm. Resistance is a fundamental property in electrical circuits that quantifies how much a device opposes the flow of electric current. The unit is named after Georg Simon Ohm, who formulated Ohm's Law, which relates voltage, current, and resistance in a circuit. According to this law, voltage (in volts) equals the current (in amperes) times the resistance (in ohms). Understanding resistance and its measurement in ohms is crucial for analyzing and designing electrical circuits, as it directly impacts how much current will flow for a given voltage. The other units mentioned in the choices represent different electrical quantities: Hertz measures frequency, Watt measures power, and Volt measures electric potential. Each has its distinct role, but only Ohm pertains specifically to the measurement of resistance.