If a hair dryer is rated at 900 W, how much energy does it require in 5 minutes?
To calculate the energy required by a device, you need to use the formula:
Energy (in joules) = Power (in watts) x Time (in seconds)
Given that the hair dryer is rated at 900 watts, we can convert the time from minutes to seconds.
1 minute = 60 seconds
So, 5 minutes is equal to 5 x 60 = 300 seconds.
Using the formula, we can now calculate the energy required by the hair dryer:
Energy = 900 watts x 300 seconds = 270,000 joules.
Therefore, the hair dryer requires 270,000 joules of energy in 5 minutes.
900 watts is 900 joules per sec
5 min is 300 sec
900 * 300 = 270 kJ