Converting joules to kilowatt-hours (kWh) is essential for understanding energy consumption, especially in electrical applications. One joule is equal to 2.777778 × 10^-7 kilowatt-hours, meaning that to convert joules to kWh, you divide the energy in joules by 3,600,000. For example, 5,000,000 joules divided by 3,600,000 equals approximately 1.388889 kWh. This conversion is crucial for accurately measuring and comparing energy usage across different systems and devices.