Which unit is used to measure electrical power?

Which unit is used to measure electrical power?

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

Answer: (C)

Power is the rate at which electrical energy is transferred or converted. The unit for power is the watt. In electrical circuits, power equals voltage times current (P = V × I), so since voltage is measured in volts and current in amperes, their product gives watts (1 V × 1 A = 1 W). A watt is also defined as one joule per second. The other units represent different quantities: volt is electric potential difference, ampere is current, and ohm is resistance. When power is expressed as P = I^2R or P = V^2/R, the units still come out to watts, confirming that watts measure power.

Power is the rate at which electrical energy is transferred or converted. The unit for power is the watt. In electrical circuits, power equals voltage times current (P = V × I), so since voltage is measured in volts and current in amperes, their product gives watts (1 V × 1 A = 1 W). A watt is also defined as one joule per second. The other units represent different quantities: volt is electric potential difference, ampere is current, and ohm is resistance. When power is expressed as P = I^2R or P = V^2/R, the units still come out to watts, confirming that watts measure power.