The kilowatt-hour (kWh) is a unit of energy widely used to measure electricity consumption and production. It represents the amount of energy expended when a device operates at a power of one kilowatt for one hour. For instance, a 60-watt light bulb running for 10 hours consumes 0.6 kWh of energy. Kilowatt-hours are crucial in electricity billing, renewable energy generation, and energy efficiency assessments. Understanding kWh is essential for managing energy costs and optimizing the use of electrical devices and systems.