Define power as the rate at which energy is transferred.

Power is defined as the rate at which energy is transferred or converted from one form to another. It quantifies how quickly work is done or energy is used in a system. The unit of power is the watt (W), which is equivalent to one joule per second (J/s). Understanding power is essential in various applications, such as electrical devices, where different appliances may have varying power ratings, indicating how quickly they can perform work or transfer energy. This concept helps in comparing the efficiency and performance of different energy-consuming devices.