We, in our daily lives, use energy from various sources for doing work. Few uses are mentioned below:
Petrol/CNG/Diesel required for running vehicles
Gas required for running stove
Electricity required to operate lights, AC, computer etc.
What are the various sources of energy available to us:
Hydro power plant
In ancient times, wood was the most common source of heat energy. In recent times, the need for energy is largely met by coal and petroleum. The fossils are non-renewable sources of energy, so we need to conserve them.
Disadvantages: Burning of fossil fuel causes pollution.
Hydro Power Plant:
Another common source of energy is the kinetic energy of flowing water or the potential energy of water at a height. Hydro power plants convert the potential energy of falling water into electricity. A large number of dams were built all over the world.
The kinetic energy associated with wind can be used to do work. For example, the rotatory motion of windmill is used to turn the turbine of the electric generator. The output of a single windmill is quite small and cannot be used for commercial purposes. Therefore, a number of windmills are erected over a large area, this is known as wind energy farm. The energy output of each windmill in a farm is coupled together to get electricity on a commercial scale.
The Sun, the life giver has been radiating an enormous amount of energy at the present rate for nearly 5 billion years and will continue radiating at that rate for 5 billion years more. But only a small part of solar energy reaches the outer layer of the earth’s atmosphere. Nearly half of it is absorbed while passing through the atmosphere and rest reaches the earth’ surface.
Due to gravitational pull/force of moon, the level of water on earth’s surface rises and falls leading to tides. Tidal energy is harnessed by constructing a dam across a narrow opening to the sea. A turbine fixed at the opening of the dam converts tidal energy to electricity.
Most powerful and most dangerous.
In a process called nuclear fission, the nucleus of a heavy atom (such as uranium, plutonium or thorium), when bombarded with low energy neutrons, can be split apart into lighter nuclei.
This process, releases tremendous amount of energy. This energy can be further used to produce steam and generate electricity.
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