How do windmills make electricity?

1 Answer
Apr 7, 2018

The kinetic energy of the air molecules hitting the fan blades are turned into electrical energy.


According to this booklet in table 8.1 the power output of a wind turbine is given by:


#A#= Area created by the turbine blades (using the blade length as the radius)
#rho#= the air density (in kg)
#v#= the speed of the wind

This looks very similar to something else...


The formula for kinetic energy.

This is because the wind turbine is based on using kinetic energy. A wind turbine's energy output is determined by how many air molecules are hitting it at a given instance and with what speed- their kinetic energy. The kinetic energy of the air molecules is transferred to the turbine blades, which gives the blades kinetic energy. In turn, they transfer their kinetic energy to a generator or alike, which can produce electrical energy.