About this video

Eann talks us through the following example:

A hand-dryer, designed for use in public toilets, generates two 200m/s sheets of air at approximately room temperature and at about 30cm above the air intake. The total flow rate is 32 litres/second and the manufacturers claim it will dry your hands in 12 seconds.

Calculate the energy used by the dryer to dry your hands, stating any assumptions made.

Taken from Energy: Thermodynamics in Everyday Life https://www.futurelearn.com/courses/energy/1