What unit measures electrical resistance?

The unit that measures electrical resistance is the Ohm, represented by the symbol Ω. Resistance refers to how much a material opposes the flow of electric current. According to Ohm's Law, resistance in a circuit is defined as the voltage across the circuit divided by the current flowing through it. This relationship is fundamental to understanding how electrical circuits operate.

The other units listed are used to measure different electrical properties: volts measure electric potential difference, amperes measure the flow of electric current, and watts measure electrical power (the rate of doing work or consuming energy). Each of these units is crucial in the field of electrical engineering, but when specifically discussing electrical resistance, the Ohm is the only relevant unit.