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