Which is the correct unit for power?

Which is the correct unit for power?

• A. Watts
• B. Joules
• C. Newtons
• D. Farads

Answer: (A)

Power is the rate at which energy is transferred or work is done. To describe how fast energy moves, we use units that express energy per unit time. The joule-per-second unit is defined as one watt, so power is measured in watts. This makes sense: a 60-watt light bulb means it uses energy at a rate of 60 joules every second. The other options correspond to different quantities—joules measure energy, newtons measure force, and farads measure capacitance—so they don’t describe how quickly energy is transferred.

Power is the rate at which energy is transferred or work is done. To describe how fast energy moves, we use units that express energy per unit time. The joule-per-second unit is defined as one watt, so power is measured in watts. This makes sense: a 60-watt light bulb means it uses energy at a rate of 60 joules every second. The other options correspond to different quantities—joules measure energy, newtons measure force, and farads measure capacitance—so they don’t describe how quickly energy is transferred.