What unit is used to measure electrical resistance?

The unit used to measure electrical resistance is the Ohm. This unit, symbolized by the Greek letter Omega (Ω), quantifies how strongly a material opposes the flow of electric current. According to Ohm's Law, resistance is calculated by the ratio of voltage (measured in Volts) across a conductor to the current (measured in Amperes) flowing through it. Therefore, if a conductor has a high resistance, it will require more voltage to push the same amount of current compared to a conductor with lower resistance.

Understanding resistance is crucial for designing and analyzing electrical circuits, as it affects current flow and voltage drops across components. The other units listed—Volts, Amperes, and Watts—are associated with other electrical parameters such as voltage, current, and power, respectively, and do not measure resistance.