What is the correct abbreviation for kilowatt-hour?

The correct abbreviation for kilowatt-hour is written as "kWh." This notation uses a lowercase "k" for kilo, which is a standard convention in SI (International System of Units) to represent metric prefixes. The "W" stands for watts, and the "h" denotes hours. It is important to use the appropriate capitalization because "k" (kilo) and "W" (watts) are distinctly defined in scientific contexts, ensuring clarity in communication of measurements.

Using an uppercase "K" in the abbreviation is not standard, as it may cause confusion with the temperature unit Kelvin, which also uses an uppercase "K." Thus, "kWh" is the widely accepted format that denotes energy consumption over time, critical for understanding electricity billing and usage in various applications.