| Wind turbine is an apparatus that is used to | | | | A wind turbine essentially is constituted by the |
| harness the potential energy of the high speeding | | | | blades that are in direct contact with the winds |
| winds to first mechanical and then electrical | | | | and convert this kinetic energy of the wind into |
| energy. A wind turbine is a complex set up which | | | | the mechanical energy by rotating. This rotating |
| consist of turbine blades, a motor, a gearbox and | | | | mechanical energy is then passed on to a motor |
| an electrical generator to whip up electricity and | | | | which is further connected to an electric |
| then pass it onto a device that needs it. | | | | generator which converts this mechanical energy |
| HISTORY OF WIND TURBINES | | | | into electricity. This electricity can be used directly |
| The history of harnessing the wind energy is very | | | | by connecting the appliance to the generator or |
| vast and goes back thousands of years in the BC | | | | can be stored in electrical cells for future use. |
| era, and so do the devices used for this purpose. | | | | Based on the type of placement of the above |
| The mention of wind machines can be seen when | | | | mentioned parts the wind turbine can of the |
| reading the history of the Persian Empire as early | | | | horizontal axis type or the vertical axis type, the |
| as 200 BC. These machines were then adopted | | | | latter being more proficient and widely used. |
| by the Romans in the year 250 AD. However the | | | | In case of the horizontal axis turbine the gearbox |
| first realistic windmill that came in practical use | | | | that accelerates the rate of rotations to suit the |
| was developed in Sistan, Iran, much later in the | | | | requirements of the generator, and the blades are |
| seventh century. | | | | positioned in the direction of the incoming wind. All |
| Most of the old windmills were developed to | | | | the constituent parts including the generator are |
| generate only mechanical power and aid in works | | | | to be supported on the top of the tower. |
| such as grinding of grains and pumping water. In | | | | In contrast the vertical axis wind turbine is |
| the Dutch Empire numerous windmills were utilized | | | | designed in such a way that it can respond to |
| to pump the Rhine water. The blades that moved | | | | different wind directions and is also adaptable to |
| due to high speed winds hitting them would pass | | | | conditions where the wind speeds are not |
| on this energy to move water pumping motors | | | | constant, to give out the exact results. |
| or motors used to run grinding machines. | | | | The wind turbine is an easy and pollution free way |
| Wind turbines that are used to generate electricity | | | | to utilize the renewable source of wind energy. |
| were only developed in the twentieth century and | | | | These are the products of the future and serving |
| have evolved a great deal since their invention. | | | | mankind well in the midst of energy crises. |
| WORKING OF THE WIND TURBINES | | | | |