Define power as the rate at which work is done.

Power is defined as the rate at which work is done. This means it measures how quickly energy is transferred or converted from one form to another. In practical terms, if a device does a certain amount of work in a shorter time, it has a higher power rating. For example, a powerful motor can lift a weight faster than a less powerful one, demonstrating that power is crucial in understanding the efficiency and performance of machines and systems. The unit of power is the watt (W), which is equivalent to one joule per second.