What is the unit of resistance?

What is the unit of resistance?

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

Answer: (A)

Resistance is measured in ohms, which come from Ohm’s law as the ratio of voltage to current. In the SI system, one ohm is defined as 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. In other words, R = V / I and the unit of R is volts per ampere, written as ohms (Ω). This means higher resistance gives less current for the same voltage. The volt is the unit of electric potential difference, the ampere is the unit of current, and the joule is a unit of energy, so they aren’t the unit of resistance.

Resistance is measured in ohms, which come from Ohm’s law as the ratio of voltage to current. In the SI system, one ohm is defined as 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. In other words, R = V / I and the unit of R is volts per ampere, written as ohms (Ω). This means higher resistance gives less current for the same voltage. The volt is the unit of electric potential difference, the ampere is the unit of current, and the joule is a unit of energy, so they aren’t the unit of resistance.