1. Convert minutes to hours:
* 15 minutes / 60 minutes/hour = 0.25 hours
2. Calculate energy using the formula:
* Energy (kWh) = Power (kW) * Time (hours)
* Energy = 1.200 kW * 0.25 hours
* Energy = 0.3 kWh
Therefore, drying your hair for 15 minutes with a 1.200 kW dryer uses 0.3 kilowatt-hours of energy.