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Bio fuels:fuel cells solar and hydro power

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Introduction

Bio fuels: Bio fuels are gained from processing living or once living matter and burning the products. For example sugar cane can be grown and fermented with the purpose of making ethanol which can be used in the place of other dirtier fuels. There is no extensive method as to this apart from collecting the product and burning it. The thing that makes this so good is that the plant takes in carbon as carbon dioxide throughout it's life and by burning the product, ethanol for example, only that finite quantity is put back into the atmosphere. Chemical fuel cells: "If you want to be technical about it, a fuel cell is an electrochemical energy conversion device." What the cell simply does is handle the electrical energy produced as a product of a chemical reaction. The reaction which takes places is: The plus points to this process are that directly the production of the electricity doesn't directly contain ...read more.

Middle

Ethanol is used and "reformed" to produce hydrogen gas and carbon dioxide, trying hard to reduce the amount of carbon monoxide produce. This still contributes to carbon dioxide emission but I imagine this produces less carbon dioxide and few other waste gases because the reaction the ethanol undergoes uses a catalyst, specific for only that reaction not helping any impurities react and escape. Hydroelectricity: Hydro electrical power stations are found often in mountainous regions with large rivers flowing down the mountains. They are useful because in the foreseeable future the water wont dry up and MOST importantly, no hazardous bi-products are formed during the production of the electricity. Also the production of the energy can be a 24hour thing. On the other hand however power may not be needed 24hours a day so the person producing it will just sell it off cheap. ...read more.

Conclusion

The one obvious major advantage is the fact that the source of energy is free and readily available, also no waste products are produced at all and he energy will be around for a long time and the technology is slowly becoming more widely available. Though on the downside, at the moment solar energy is costly to produce as top end solar arrays are very expensive, there ability to work is directly dependant on the area and the time. and somewhat inefficient. 1) Sunlight excites the material and therefore electrons move more, volume of electrons increases and the blue semiconductor becomes negatively polar so repels the electrons. 2) The electrons are attracted the competitively positively charged semiconductor so move across the gap. 3) This movement and the subsequent movements of the electrons around the rest of the circuit allow current to flow. ?? ?? ?? ?? ...read more.

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