The unit of power is represented by the

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

Answer: (D)

Power is the rate at which energy is transferred or converted in an electrical circuit. It’s defined by the relationship P = V × I, where V is voltage and I is current. The unit that measures this rate is the watt. One watt equals one joule of energy transferred per second, and because P = V × I, volts times amperes naturally gives watts (V × A = W).

The other options correspond to different electrical quantities: Ohm is the unit of resistance, Volt is the unit of electric potential difference, and Ampere is the unit of electric current. For example, a device rated in watts tells you how much energy it uses each second, while volts tell you the driving force and amperes tell you how much current flows.