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Renewable Energy

 
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Stanton59



Joined: 19 Jun 2010
Posts: 1
PostPosted: 19 Jun 2010 09:28 am    Post subject: Renewable Energy Reply with quote
Renewable energy is what the world is turning to as the fossil fuel energy gets too expensive. This type of energy can be renewed and is available free of cost. The renewable energy is present in the form of wind, water and the sun. Initially a renewable energy plant may seem to be costly but in the long run, renewable energy is sure to save the investors a great deal of money.

Investments in renewable energy are also welcome by the environmentalists as the fossil fuel energy is alleged to contribute towards the global warming. It is found that the non-renewable sources of energy cause high emissions of carbon and other molecule chains that create a greenhouse effect on Earth

Renewable energy like the solar power uses the sun’s energy to heat water and lighting up the interiors of houses. There are other sources of renewable energy like the wind and the ocean water that can be used for generating electricity.
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Richard111
Experienced User


Joined: 19 Sep 2008
Posts: 420
Location: Pembrokeshire
PostPosted: 17 Jul 2010 07:04 am    Post subject: Reply with quote
Hi all, this link gives an idea of the meaning of the word energy in relation to the word renewable. The article has been written for the layman.

Understanding E = mc^2

By William Tucker

Quote:
What about solar energy? Solar radiation is the result of an E = mc2 transformation as the sun transforms hydrogen to helium. Unfortunately, the reaction takes place 90 million miles away. Radiation dissipates with the square of the distance, so by the time solar energy reaches the earth it is diluted by almost the same factor, 10-15. Thus, the amount of solar radiation falling on a one square meter is 400 watts, enough to power four 100-watt light bulbs. “Thermal solar” – large arrays of mirrors heating a fluid – can convert 30 percent of this to electricity. Photovoltaic cells are slightly less efficient, converting only about 25 percent. As a result, the amount of electricity we can draw from the sun is enough to power one 100-watt light bulb per card table.

_________________
"99.9 percent of ocean heat is derived from sunlight at wavelengths less than 3 microns."
Dr Willem de Lange, a Senior Lecturer in the Department of Earth and Ocean Sciences at the University of Waikato in New Zealand
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