SUBJECT: BASIC TECHNOLOGY
TERM: 3RD TERM
TOPIC: ENERGY SOURCES- WINDMILL
Wind is another form of energy just like the solar radiation beamed from the sun, the water behind a dam, the stored energy in fuel.
When wind blows through open windows and doors into our rooms, we sometimes notice that ceiling fan can start to rotate even though it is not switched on.
Children make propeller with paper and broom stick. The blades revolve freely on the main shaft. As you hold the ma in shaft in your hand and run fast, the blades rotate at a speed that depends on how fast you can run.
Thus, if a propeller with the blades firmly attached to its main shaft is installed on top of a mast. When the wind blows, it will rotate the blades and hence the shaft to which they are firmly connected. Thus, this system has converted the wind energy to the mechanical energy of the rotating blades and the shaft. Such mechanically energy can be used directly for grinding, pumping water e.t.c. To generate electricity, the above system is joined to an electric generator, which converts its mechanical energy to electrical energy.
How to generate electricity using a windmill
Wind mill receives its source of energy from the wind blowing. Therefore, the blades of the windmill must be placed in such a way it come receive maximum wind. The blades begin to turn converting the wind energy to mechanical energy. A turbine-generator is connected to the blades by a drive mechanism. The generator, will in-turn, produce electricity.
Read “RENEWABLE ENERGY –WIND ENERGY”
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