Converting kilowatt-hours (kWh) to joules (J) is essential for understanding energy measurements in various applications. One kilowatt-hour equals 3,600,000 joules, as a kilowatt-hour represents the energy consumption of 1,000 watts over one hour, and one hour equals 3,600 seconds. Therefore, to convert kilowatt-hours to joules, multiply the energy in kilowatt-hours by 3,600,000. For example, 2 kWh is equivalent to 7,200,000 joules (2 × 3,600,000). This conversion is crucial in fields like physics, engineering, and energy management, where different units of energy measurement are used.