Electrotechnique Industrielle Guy Seguier Ebook _TOP_ Full Zip Utorrent (epub)

It's startling to think that more than a century ago, people had no idea how electric power worked. Now, one of the basic technologies on which our society is based is so ubiquitous that we barely think about it. But the inner workings of electric power are actually quite complex. An understanding of them can help us improve our systems, cut costs, and make our lives more convenient. Electricity is very important to the United States economy. According to statistics from the Department of Commerce, in 2010 electricity generated or purchased by industry totaled $127 billion, 8 percent of all energy produced in the U.S.Electrochemical cells are perhaps the most familiar type of fuel cell; they convert chemical energy directly into electrical energy by means of an electrochemical reaction between two electrodes immersed in a liquid electrolyte. The energy conversion in fuel cells is remarkably efficient. It may approach 70 percent theoretical maximum efficiency for converting chemical energy into electricity when operating at temperatures and pressures that liberate the maximum amount of heat in the forward half-cell reactions and in the reverse half-cell reactions. Electrolytic cells, on the other hand, use an electric current to produce a chemical reaction. In electrolysis of waterthe hydrogen and oxygen gases evolved can be used as fuels or stored for future use, such as in fuel cells or to make synthetic liquids such as ammonia (NH3). Electrolysis is used to produce hydrogen fuel from water, and to produce oxygen for use in life support systems such as the Joint Rescue Gas System. Fuel cells are one of the most promising technologies for energy production of the future. They can be combined with solar panels and wind turbines to enable electricity generation without carbon emissions. Solar panels and wind turbines will provide an inexhaustible source of clean power if we can develop more efficient methods of converting them into usable electricity. Fuel cells will provide a reliable, constant source of electricity for electrical power grids and vehicles if we can overcome some technical obstacles and reduce production costs. Fuel cells have several advantages over other electrochemical technologies for producing hydrogen fuel directly from water. Hydrogen is the lightest and most abundant element in the universe. It can therefore be easily separated from oxygen using fuel-cell technology. Fuel cells are also inherently safer because the hydrogen gas does not ignite or explode when it mixes with air, nor are there any open flames, sparks, or hot surfaces. Fuel cells produce pure hydrogen at very high pressure, producing less energy per unit of energy input than electrolysis but allowing more energy to be stored in the form of hydrogen gas. Turbine refers to a device that converts mechanical energy into electrical power that is used to drive an electric generator or motor.

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