Which unit measures electrical power?

Which unit measures electrical power?

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

Answer: (B)

Power in an electrical circuit is the rate at which energy is transferred. The unit for that rate is the watt. A watt is defined as one joule per second, so it directly expresses how quickly energy is used or produced. In circuits, power is calculated as P = V × I, which naturally leads to the watt as the standard unit. A volt measures electrical potential difference, an ampere measures current, and a joule is an amount of energy, not a rate. So the correct unit for electrical power is the watt.

Power in an electrical circuit is the rate at which energy is transferred. The unit for that rate is the watt. A watt is defined as one joule per second, so it directly expresses how quickly energy is used or produced. In circuits, power is calculated as P = V × I, which naturally leads to the watt as the standard unit. A volt measures electrical potential difference, an ampere measures current, and a joule is an amount of energy, not a rate. So the correct unit for electrical power is the watt.