What unit is used to measure electrical resistance?

The unit used to measure electrical resistance is the ohm. Electrical resistance quantifies how much a material opposes the flow of electric current. According to Ohm's Law, which states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points, resistance (R) is defined as the ratio of voltage to current (R = V/I). Therefore, the ohm, symbolized by the Greek letter omega (Ω), serves as the fundamental unit for this measurement.

In contrast, volts measure electrical potential or electromotive force, which is the pressure that pushes electric charges through a circuit. Watts quantify electrical power, representing the rate of energy transfer, and farads measure capacitance, which indicates a capacitor's ability to store an electric charge. Each of these units has a distinct role in electrical theory and applications, but when it comes to resistance specifically, the ohm is the universally recognized unit.