How is electrical energy measured?

Electrical energy is measured in kilowatt-hours (kWh), which quantifies the amount of energy consumed over a period of time. One kilowatt-hour represents the energy consumed when a power of one kilowatt operates for one hour. This unit is commonly used by utility companies to bill customers for their electricity usage.

The other units listed have different specific purposes. Amperes measure electric current, which is the flow of electric charge. Volts measure electrical potential or voltage, indicating how much potential energy exists to push electric charges through a circuit. Ohms measure resistance, providing a sense of how much a material opposes the flow of electricity. While these units are essential for understanding electrical concepts, they do not directly measure electrical energy itself. Thus, the correct answer effectively highlights the measurement of energy in terms of its consumption over time, which is most relevant for practical use and billing.