Which consumes more energy, a 1.2 kW hair dryer used,for

Chapter 11, Problem 32E

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QUESTION:

Problem 32E

Which consumes more energy, a 1.2 kW hair dryer used,for 10 min or a 10 W night light left on for 24 h?

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QUESTION:

Problem 32E

Which consumes more energy, a 1.2 kW hair dryer used,for 10 min or a 10 W night light left on for 24 h?

ANSWER:

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We are going to compare the energy usage of the hairdryer and the right light.

The power of the hairdryer \(P_{1}=1.2 \mathrm{~kW}=1200 \mathrm{~W}\)

The power of the right light \(P_{2}=10 \mathrm{~W}\)

The time for hairdryer \(\Delta \mathrm{t}_{1}=10 \mathrm{~min}=10 \times 60 \mathrm{~s}\)

The time for night light \(\Delta \mathrm{t}_{2}=24 \mathrm{~h}=24 \times 60 \times 60 \mathrm{~s}\)

 

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