Generation of Electrical Energy :
Electrical energy is generated by conversion of energy available in different forms from different natural sources such as kinetic energy of blowing winds, pressure head of water,chemical energy of fuels and nuclear energy of radioactive substances into electrical energy.
For conversion of mechanical energy into electrical energy, electrical machines (generators or alternators) driven by prime movers (petrol engines, diesel engines, steam engines, steam turbines, gas turbines or hydraulic turbines) are employed.
The alternate method of generating electrical energy without the use of prime movers consists of magneto hydro-dynamics, thermionic and thermoelectric generation: but all this methods are in experimental stages and of little commercial or industrial importance.
The main source of energy are the sun, wind, terrestrial heat, ocean tides and waves, water, fuels and radioactive substances.
The last three sources i.e. water, fuels and radio-active substances are most dependable and are commonly used for generation of electrical energy.
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