Which of the following is the unit of electrical resistance?

The unit of electrical resistance is the Ohm. This unit is named after the German physicist Georg Simon Ohm, who formulated Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points, provided the temperature remains constant. In practical terms, Ohm is used to quantify how much a material opposes the flow of electric current.

Resistance is essential in electrical circuits, as it helps to manage the flow of electricity and ensures that components operate within safe limits. Understanding resistance and its measurement in Ohms is critical for technicians and engineers when designing and troubleshooting HVAC systems and other electrical applications.

Volt, Watt, and Ampere represent different electrical concepts: voltage, power, and current, respectively. While they are related to electricity, they do not measure resistance. Voltage measures the electric potential difference, power quantifies the rate of energy transfer, and current refers to the flow of electric charge. Hence, the Ohm stands out as the correct unit for electrical resistance.