Kw-hr, or kilowatt-hour, is a commonly used unit of electrical energy. Kilowatt-hour measures the amount of energy used by an electrical appliance over a period of time. Synonyms for kw-hr include kilowatt-hour per year, hour-kilowatt, and thousands of watts per hour. Other similar units of measurement for electrical energy consumption include joules per second (J/s), megawatt-hours (MWh), and British thermal units (BTUs). Understanding these synonyms is important for accurately measuring and managing electrical energy consumption in both residential and industrial settings. Tracking and reducing kw-hr usage can not only save money but also help contribute to a more energy-efficient and sustainable future.