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Which consumes more energy, a 1.2 kW hair dryer used,for
Chapter 11, Problem 32E(choose chapter or problem)
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?
Questions & Answers
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:
Step 1 of 3
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 \(\Delta \mathrm{t}_{2}=24 \mathrm{~h}=24 \times 60 \times 60 \mathrm{~s}\)