A common unit of measurement for electricity is the "watt." The watt measures electrical power and is defined as one joule per second. It is used to quantify the rate of energy transfer in an electrical circuit, indicating how much energy is consumed or produced. In practical terms, watts are visible in everyday applications, such as light bulbs, where the wattage indicates how much energy a bulb consumes to produce light. For example, a 60-watt bulb uses 60 watts of electrical power while operating. Understanding watts is crucial for evaluating energy efficiency and calculating electricity costs.