What does kWh measure in the energy sector?

The correct understanding of kWh in the energy sector is that it stands for kilowatt-hour. This unit measures the amount of energy consumed over time, specifically one kilowatt of power used for one hour. It quantifies energy usage and serves as a standard billing unit for energy utilities.

For instance, if a device operates at a power of one kilowatt for one hour, it has consumed one kilowatt-hour of electricity. This measurement is crucial for understanding energy consumption patterns, calculating costs on electricity bills, and managing energy usage effectively in both residential and commercial settings.

The other options provided do not accurately represent what kWh measures or relate to energy consumption in a meaningful way.