Wind Energy

A Brief Description:

Wind power is the kinetic energy of wind, or the extraction of this energy by wind turbines. In 2004, wind power became the least expensive form of new power generation, dipping below the cost per kilowatt-hour of coal-fired plants. Wind power is growing faster than any other form of electrical generation, at about 37%, up from 25% growth in 2002. In the late-1990s, the cost of wind power was about five times what it is in 2005, and that downward trend is expected to continue as larger multi-megawatt turbines are mass-produced.





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Solar Energy

A Brief Description:

Solar energy is considered the clean and renewable source of energy for the future. It can be derived directly as in the following examples:

Sunlight hits a photovoltaic cell (also called a photoelectric cell) creating electricity.

Sunlight hits the dark absorber surface of a solar thermal collector and the surface warms. The heat energy is carried away by a fluid circuit.

Sunlight strikes a solar sail on a space craft and is converted directly into a force on the sail which causes motion of the craft.

Sunlight strikes a light mill and causes the vanes to rotate, although little practical application has yet been found for this effect.

Sunlight is focused on an externally mounted fibre optic cable which conducts sunlight into building interiors to supplement lighting.





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Renewable Energy Source

A Brief Description:

Renewable energy sources or RES are the sources of energy that is captured from existing flows of energy, from on-going natural processes, such as sunshine, wind, flowing water, biological processes, and geothermal heat flows.





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