Power is defined as

Power is defined as

• A. The amount of work per unit time
• B. The rate at which energy is transferred
• C. The energy stored in a capacitor per cycle
• D. The amount of energy lost as heat per cycle

Answer: (A)

Power is the rate at which work is done, or energy is transferred, per unit time. In formula terms, it’s energy transferred divided by time (P = W/t or P = dE/dt). This is why the best description is the amount of work done per unit time: it directly measures how quickly energy is moving or being converted. A practical example is a 60-watt light bulb, which delivers energy at 60 joules per second. This emphasizes the speed of energy transfer, not just how much energy is stored or how much energy is expended in a single cycle. Energy stored in a capacitor per cycle, or energy lost as heat per cycle, concerns quantities that aren’t about the rate of energy transfer.

Power is the rate at which work is done, or energy is transferred, per unit time. In formula terms, it’s energy transferred divided by time (P = W/t or P = dE/dt). This is why the best description is the amount of work done per unit time: it directly measures how quickly energy is moving or being converted. A practical example is a 60-watt light bulb, which delivers energy at 60 joules per second. This emphasizes the speed of energy transfer, not just how much energy is stored or how much energy is expended in a single cycle. Energy stored in a capacitor per cycle, or energy lost as heat per cycle, concerns quantities that aren’t about the rate of energy transfer.