The idea of building windmill can easily be traced back to the ancient trend of mankind to use the force of nature for our benefit. The basic principle of a windmill is to rotate large turbines when the wind blows and use that energy to produce electricity. The mechanical energy that is created from the rotation of the turbines is converted to electrical energy and stored for later use. There is some initial cost of setting up the windmills and after that it’s like free energy from nature.
A windmill is a machine that is powered by the energy of the wind. It is designed to convert the energy of the wind into more useful forms using rotating blades or sails. The term also refers to the structure it is commonly built on. In much of Europe, windmills served originally to grind grain (hence the "mill" derivation), though later applications included pumping water and, more recently, generation of electricity. Contemporary electricity-generating versions are referred to as wind turbines.
In the context of our country, where we continually suffer from load shedding, windmill sounds like a creative solution. Although the idea of setting up windmills here is a new idea, the concept is lot older. We have the “Kaptai Dam” in “Karnafuli” where we use the force of water to produce electricity which is based on the same principle.
Background
According to definition, a windmill is - "a machine that is powered by the energy of the wind." There are two basic kinds of windmills. One kind, the horizontal mill has sails that revolve in a horizontal plane around a vertical axis. Such mills are known from the 7th century AD in the region around modern Iran and Afganistan. [Gimpel 1976 p. 24]
It is relatively easy to attach a grindstone directly to the rotating vertical axis (made of wood). On the other hand typical rotational speeds of such mills (dictated by the wind) are unsuitable for efficient grinding of grain.
The other