Answered

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?

A0.300 kWh
B1.200 kWh
C1.800 kWh
D18.000 kWh

Verified Answer :

Answer: Option (A) is the correct answer.

Explanation:

The given data is as follows.

     Power = 1.200 kW,         Time = 15 minutes = \(\frac{15min}{60 min/hr}\) = 0.25 hour

     Energy = ?

Thus, calculate the energy by using the formula as follows.

               Power = \(\frac{Energy}{Time}\)

               Energy = Power × Time

                            = 1.200 kW × 0.25 hr

                            = 0.300 kWh

Thus, we can conclude that 0.300 kWh energy is used in drying your hair.

asuwafohjames

The energy of the hair drier is 0.3 kWh. The right option is A. 0.3 kWh

To calculate the energy used to dry the hair, we use the formula below.

Formula:

  • P = E/t................ Equation 1

Where:

  • P = Power of the drier
  • E = Energy used to dry the hair
  • t = time.

Make E the subject of the equation.

  • E = Pt................ Equation 2

From the question,

Given:

  • P = 1.2 kW
  • t = 15 minutes = (15/60) = 0.25 hours.

Substitute these values into equation 2

  • E = 1.2(0.25)
  • E =  0.3 kWh.

Hence, The energy of the hair drier is 0.3 kWh. The right option is A. 0.3 kWh

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