What does a kilowatt-hour (kWh) measure?

A kilowatt-hour (kWh) is defined as a unit of energy that represents the consumption of one kilowatt of power used for one hour. This measurement arises from the fundamental relationship in physics where power is defined as the rate at which energy is used or generated over time.

In practical terms, when you use an appliance rated at one kilowatt for one hour, you have consumed one kilowatt-hour of energy. This measurement is crucial for understanding energy usage in residential and commercial settings, as it directly relates to electricity billing and energy efficiency evaluations.

Understanding kWh is essential for electric station operators because it helps them monitor energy production, distribution, and consumption, allowing for effective energy management and operational planning.