The unit of power is the watt, symbolized as W. A watt is defined as one joule of energy transferred or converted per second. It quantifies the rate at which work is done or energy is transferred in an electrical system. The concept of power is fundamental in various fields, including physics and engineering, and it is crucial for understanding the performance of electrical devices and systems. For example, a light bulb rated at 60 watts consumes 60 joules of energy every second it is on, providing a basis for evaluating energy efficiency.