If it takes 15 minutes to dry your hair with a 1.200 kW hair drier, how much energy is used in drying your hair?

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29-05-2022
Mathematics

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If it takes 15 minutes to dry your hair with a 1.200 kW hair drier, how much energy is used in drying your hair?

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ap8997154 ap8997154 · Answer 1 · 2022-05-31T12:24:43+02:00

The quantity of energy moved or transformed per unit of time is referred to as power. The amount of energy that is consumed by the hairdryer in 15 minutes will be 0.3 kWh.

What is power?

The quantity of energy moved or transformed per unit of time is referred to as power.

Formula: Power = Energy / Time

Units: kW = kWh / hour

The power of electric equipment is given by the formula,

P = E/t

where E is the energy consumed in kWh and t is the time in hours.

Given the power of the hairdryer is 1.200 kW while the time for which it is kept on is 15 minutes, therefore, 0.25 hours. Now, the energy consumed by the dryer in 15 minutes will be,

1.200 kW = E / 0.25

0.3 kWh = E

Hence, the amount of energy that is consumed by the hairdryer in 15 minutes will be 0.3 kWh.

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