The SI unit of electrical resistance is

The SI unit of electrical resistance is

• A. Volts
• B. Ohms (Ω)
• C. Amperes
• D. Watts

Answer: (B)

Resistance is measured in ohms. The ohm (Ω) is defined as the resistance between two points of a conductor where a constant potential difference of one volt, applied to those points, produces a current of one ampere. In practical terms, resistance is what you get when you divide voltage by current (R = V / I). So the unit for R is volt per ampere, which is the ohm. Volts measure potential difference, amperes measure current, and watts measure power, so those other units don’t describe resistance.

Resistance is measured in ohms. The ohm (Ω) is defined as the resistance between two points of a conductor where a constant potential difference of one volt, applied to those points, produces a current of one ampere. In practical terms, resistance is what you get when you divide voltage by current (R = V / I). So the unit for R is volt per ampere, which is the ohm. Volts measure potential difference, amperes measure current, and watts measure power, so those other units don’t describe resistance.