Final answer:
Power is correctly defined as the rate at which work is done, calculated by the work done divided by the time taken, and is measured in watts (1 W = 1 J/s).
Step-by-step explanation:
Power is indeed the rate at which work is done. To calculate the average power (P), you can use the following equation: P = W/t, where W is the work done and t is the time over which this work is carried out. The SI unit for power is the watt (W), which is equivalent to 1 joule per second (1 J/s). It is important to understand the distinctions among force, work, energy, and power. While force exerted over a distance does work, work can increase energy, and energy can do work. Power is specifically about the rate at which this work is performed or energy is transferred.