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Analysing different types of Energy.

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Energy In order for work to be done by machines or human beings, they need to possess energy. It is measured in the same units as work, namely joule (I) with practical values often being expressed in kilojoule (kJ), megajoule or gigajoule (GJ). Energy, like work, does not possess direction and is as quantity. It can take several forms and may be converted from one form to another. Kinetic energy This is the energy that a body possesses because of its motion. The greater speed at which it is moving the greater its kinetic energy. The energy in if case is equal to the work done by the body in coming to rest. A hammer possesses kinetic energy as it strikes a nail and this energy enables it to do work driving the nail into a piece of wood. Linear and angular motion both give rise to kinetic energy. Potential energy This is the energy that a body possesses because of its position in a particular type of field: gravitational, electric, magnetic or nuclear. Gravitational potential energy for example equals the amount of work that the body can as it falls towards the Earth under the pull of gravity. ...read more.


The amount of energy available from the fuel is called its calorific value and it is usually quoted for 1 kg. In the case of gaseous fuels it may be given in terms of volume. The energy released during combustion may be used directly for heating purposes or it may be converted to other forms. Electrical energy Electricity is not a form of energy itself but it is often a very convenient means of transferring energy from one body to another. We use the term 'electrical energy' for the energy being transferred. The energy transferred in this way can be stored in electrochemical batteries as potential energy. Sources of Energy Solar energy Enormous amounts of energy reach the outer atmosphere of the Earth from the Sun. The quantity reaching the surface depends upon the ozone layer, dust, clouds and latitude. Even in temperate latitudes it can amount to 500 W/m2. This energy is readily available for producing hot water and spa heating using simple solar panels. Installation costs are high, however, and the energy available decreases in winter when the requirement is greatest. ...read more.


The tidal mill at Woodbridge in Suffolk had been working for 200 years when it closed in 1957 and the first such mill on the site was built in about 1170. Hydroelectric power In mountainous countries substantial amounts of power can be generated from the potential energy of water stored by dams. Although the construction costs can be very high the direct cost of production is very small. Wave energy The vertical motion of the sea can be utilised to generate power in several ways. One system uses the relative movements of floating rafts to convert the wave energy. Very large amounts of energy are theoretically available, particularly in the winter when the requirement is greatest. Geothermal energy We know that very high temperatures exist within the Earth and in some places heat in practical quantities is available at the surface. Hot springs have been used at least since Roman times. There are installations in several countries, which use geothermal energy to generate electricity. Wind energy Wind power has been harnessed for many centuries and is now seriously considered for the generation of electricity. We can make a rough estimate of the power available from a windmill by considering the kinetic energy of the air approaching the circle swept out by the blades. Steven Mckibbin 1 ...read more.

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