Which consumes more energy, a 1.3 kW hair dryer used for 10 min or a 10...
Which consumes more energy, a 1.3 kW hair dryer used for 10 min or a 10 W night light left on for 24 hr?
hair dryer night light They both use the same energy.
How much energy does each use?
| hair dryer | J |
| night light | J |
Homework Answers
Energy consumption = Power * Time
For a 1.300 kW dryer used for 10 minutes,
Energy = 1.3 kW * 1000 watts/kW * 10 min * 60 sec/min = 780,000
joules
For a 10 W night light used for 24 hours,
Energy = 10 watts * 24 hours * 3600 sec/hr = 864,000
joules
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