What is a kilowatt-hour (kWh)?

A kilowatt-hour (kWh) is defined as one kilowatt of power used for one hour. This unit represents the amount of energy consumed when a device with a power rating of one kilowatt operates continuously for one hour. This definition is crucial in understanding electricity consumption and billing, as it quantifies energy usage in a way that is meaningful for consumers and utilities alike.

This unit of measurement allows consumers to assess how much electricity they use over time, making it easier to track consumption on their utility bills. For instance, if a light bulb rated at 100 watts is used for 10 hours, it would consume 1 kWh of energy (0.1 kilowatts times 10 hours equals 1 kWh). This understanding is vital for both energy management and efficiency measures.

The other choices, although related to energy, do not accurately define what a kilowatt-hour is. Monthly electricity use can vary significantly based on many factors and is not a specific measure like the kWh. Similarly, while energy efficiency refers to how well a device uses energy to perform its intended function, it does not define a kWh. Lastly, the production of energy can be expressed in various units, but a kilowatt-hour specifically measures consumption