The phrase “watts per hour” represents a misunderstanding of how power and energy relate. Power, measured in watts, is the rate at which energy is used or generated. Energy, often measured in watt-hours, is the total amount of power consumed or produced over a period of time. Calculating energy consumption involves multiplying the power (in watts) by the time (in hours). For example, a 100-watt light bulb operating for 2 hours consumes 200 watt-hours (100 watts * 2 hours) of energy.
Understanding the difference between power and energy is fundamental for managing electricity consumption and costs. Accurately calculating energy usage allows for informed decisions regarding appliance selection, energy efficiency improvements, and renewable energy integration. Historically, the development of accurate methods for measuring and calculating energy consumption has been crucial for advancements in electrical engineering and power grid management. This understanding has enabled the development of more efficient technologies and sustainable energy practices.