Power is defined by which equation?

Power is defined as the rate at which work is done or energy is transferred over time. The correct formulation is that power equals energy divided by time. This relationship indicates how much energy is used or converted in a given amount of time, making it a crucial concept in various fields, including physics and engineering.

Understanding this definition of power is essential in applications such as evaluating the efficiency of systems, understanding how electrical devices consume energy, and performing calculations related to energy usage in buildings. The other options do not accurately capture this relationship; for example, energy added to mass or energy multiplied by time does not provide a meaningful definition of power, and energy minus work does not relate to the rate of energy transfer or consumption.