Real power in electrical terms is measured in which unit?

• A. Watt
• B. Joule
• C. VA
• D. KW

Answer: (D)

Real power is the rate at which electrical energy is actually converted to useful work. The basic SI unit for power is the watt, defined as one joule per second. In practical applications, we often see larger powers written in kilowatts, where 1 kilowatt equals 1000 watts, simply to keep numbers manageable. Joule is a unit of energy, not power, so it doesn’t express rate. VA (volt-amps) represents apparent power and doesn’t equal real power because it doesn’t account for the phase difference between voltage and current. So the fundamental unit for real power is the watt, with kilowatts used for convenience when dealing with larger values.