Power is measured in which units?

Power is measured in which units?

• A. Volts
• B. Watts
• C. Amperes
• D. Joules

Answer: (B)

Power is the rate at which energy is transferred or work is done. In electrical contexts, it’s given by P = V × I, so the unit of power is the product of voltage and current. That product is the watt, and 1 watt equals 1 joule per second. Volts measure electric potential, amperes measure current, and joules measure energy, not rate. So the unit that expresses how quickly energy is delivered or used is the watt. For example, a 60-watt bulb uses energy at a rate of 60 joules per second.

Power is the rate at which energy is transferred or work is done. In electrical contexts, it’s given by P = V × I, so the unit of power is the product of voltage and current. That product is the watt, and 1 watt equals 1 joule per second. Volts measure electric potential, amperes measure current, and joules measure energy, not rate. So the unit that expresses how quickly energy is delivered or used is the watt. For example, a 60-watt bulb uses energy at a rate of 60 joules per second.