00:01
Is it more expensive to operate a 1000 watt hair dryer for 5 minutes or a 40 watt lamp for 1 hour? so that's going to be based on the amount of energy.
00:12
Whichever operation uses more energy that would be more expensive.
00:16
So the total energy for, we'll do the hair dryer first.
00:24
So the energy of the hair dryer, that would be calculated by the power which is measured in kilowatts.
00:33
Usually is how that would be shown.
00:37
Kilowatts times time which would usually be measured in hours.
00:43
That gives our units for the energy to be kilowatt hours which is what that would usually be measured in electricity pricing.
00:54
So the energy for the hair dryer, the power is 1000 watts.
00:59
So what we would want to calculate kilowatts or convert that to kilowatts.
01:03
So 1000 watts is equal to 1 kilowatt.
01:06
So our power is 1 kilowatt times the time in hours.
01:12
We have 5 minutes.
01:14
If we convert that to hours we would multiply by 1 hour over 60 minutes.
01:22
Minutes would cancel and we get 5 60ths of an hour which is 1 12th of an hour.
01:28
So we multiply that by 1 12th of an hour...