Renewable Energy
Since the early Stone Age human beings were struggling for a decent living. They were inventing an invention every time to improve their life. Until they discovered electricity in the 17th century. The electricity is a great discovery because no one can imagine how life will be without electricity. However there are many sources of energy which can be used. I'm going to write about three types of renewable and clean energy.
The first source is the sun. The sunlight can generate energy by a simple principle. This is called the solar cell. It has three major processes which are absorption of the sunlight in the semiconductor material, generation and separation of free positive and negative charges. The solar cell is a very clean source but the problem is that it's generating a very weak voltage. It needs a lot of area and it costs a lot of money to be a useful energy.
http://www.accessscience.com/sun+energy&id=633000
The second source of the clean energy is the wind turbines. Since the Middle Ages the windmills were a very useful machine. They were used in many different ways. These days the windmills are used in the field of energy. They can generate a lot of electricity when located in a wind field, in those countries which have a lot of wind allround the year. http://www.accessscience.com/future+energy&id=YB021005
The third source of clean energy is the power of water. The potential energy of the water is one of the most powerful sources of energy. The human beings convert the potential energy of the water to electricity by the principle of the electrical generators. The water is driven to a turbine to make it rotate to generate electricity. This energy is called hydropower. Most of the electricity stations around the world are using it. http://www.accessscience.com/Hydropower+energy&id=YB041150
Finally this article talks about a big subject in a few lines. We hope to save our energy and use it in a proper way because if we do not maintain it we will live in a very difficult life.
Bibliography
K. W. Mitchell, Margorie L. Tatro, "Solar cell," in AccessScience, ©McGraw-Hill Companies, 2008, http://www.accessscience.com/
C. P. van Dam, "Wind turbines," in AccessScience, ©McGraw-Hill Companies, 2002, http://www.accessscience.comhttp://0-www.accessscience.com.library.hct.ac.ae/content.aspx?searchStr=future+energy&id=YB021005
Saifur Rahman, "Renewable energy sources," in AccessScience, ©McGraw-Hill Companies, 2004, http://www.accessscience.com/
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