What is the unit of electrical resistance?

• A. Volt
• B. Ohm
• C. Ampere
• D. Coulomb

Answer: (B)

Resistance is measured in ohms. The ohm is the unit that links voltage and current through R = V / I. By definition, one ohm is the resistance between two points of a conductor when a constant potential difference of one volt, applied to those points, produces a current of one ampere, with no electromotive force from the conductor itself. The volt is for potential difference, the ampere for current, and the coulomb for electric charge. So the unit for resistance is the ohm.