What is the unit of electrical power?

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

Answer: (A)

Power is the rate at which energy is transferred in an electric circuit. In electrical terms, this rate is given by P = V × I, where V is voltage and I is current. When you multiply volts by amperes, you get watts, the unit of power. So one watt means one joule of energy transferred each second.

The other terms measure different things: volt is electric potential difference, current is the flow of charges, and resistance (ohm) is how much a component resists current. Kilowatts are just larger scales of watts, used for bigger power like appliances.