The power of an electric appliance is given by P = VI, as shown in Example 11.12. The energy consumed is the product of power and time, as illustrated in the refrigerator example. The context also defines kilowatt-hour as the commercial unit of energy, where 1 kWh = 1000 Wh. Therefore, after calculating power, we multiply by time (2 hours) to get energy in watt-hours and then convert to kilowatt-hours.