What is the unit of electrical resistance?

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

Answer: (B)

The unit of electrical resistance is the ohm. This unit is defined as the resistance that produces a current of one ampere when a voltage of one volt is applied across it. The relationship between voltage, current, and resistance is described by Ohm's Law, which states that V = I × R, where V is voltage, I is current, and R is resistance. This fundamental principle is crucial in understanding how electrical circuits function. Each of the other units mentioned pertains to different electrical properties: volts measure electric potential, amperes measure electric current, and watts measure electrical power – all contributing to the broader understanding of electrical systems, but none of these represent resistance.