Which consumes more energy, a 1.3 kW hair dryer used for 10 min or a 10 W night light left on for 22 hr?
a. hair dryer
b. night light
c. They both use the same energy.

How much energy does each use?
hair dryer ___ J
night light ___ J

Question

Which consumes more energy, a 1.3 kW hair dryer used for 10 min or a 10 W night light left on for 22 hr?
a. hair dryer
b. night light    
c. They both use the same energy.


How much energy does each use?
hair dryer	___  J
night light	 ___ J

ookawaiioo · Answer

if power = work/second

Then power*seconds = work aka joules

ookawaiioo · Answer

1300 Watts* 60*10 = joules of the hair dryer
10 Watts*22*60*60 = joules of the night light

Joules = energy