A windmill is a machine used for grinding, pumping, and is used to harness energy. The secret behind how windmills work is harnessing the driving force of the wind acting upon a number of vanes or sails. People in ancient times have known how windmills work, particularly during the 7th century AD in Persia where the first known structures of this type were constructed. These have been well utilized in Europe especially in Holland. Today, they are primarily used to generate electricity. How Windmills Work Windmills use blades to accumulate wind that flows over it. These blades are used for lift...