Question

A family shares the same hairdryer.

The hairdryer has a power of 1.2 kW. The hairdryer is used for a total of 2 hours each week. Calculate how many kilowatt-hours (kWh) of energy the hairdryer transfers in 2 hours.

Answer 1

The hairdryer transfers 2.4 kilowatt-hours (kWh) of energy in 2 hours.

Step-by-step explanation:

To calculate the kilowatt-hours (kWh) of energy transferred by the hairdryer in 2 hours, we first need to convert the power from kilowatts to watts.

Since 1 kilowatt is equal to 1,000 watts, the power of the hairdryer is 1.2 kW x 1,000 W/kW = 1,200 W.

Next, we multiply the power by the time in hours:

1,200 W x 2 hours = 2,400 Wh.

Finally, we convert the watt-hours to kilowatt-hours by dividing by 1,000: 2,400 Wh ÷ 1,000 = 2.4 kWh.

Therefore, the hairdryer transfers 2.4 kilowatt-hours of energy in 2 hours.