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"watthours" - 1 õppematerjal

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Energy - põhjalik referaat energiast

In a fossil-fueled steam turbine, the fuel is burned in a furnace to heat water in a boiler to produce steam. Coal, petroleum (oil), and natural gas are burned in large furnaces to heat water to make steam that in turn pushes on the blades of a turbine. Did you know that most electricity generated in the United State comes from burning coal? In 2007, nearly half (48.5%) of the country's 4.1 trillion kilowatthours of electricity used coal as its source of energy. Natural gas, in addition to being burned to heat water for steam, can also be burned to produce hot combustion gases that pass directly through a turbine, spinning the blades of the turbine to generate electricity. Gas turbines are commonly used when electricity utility usage is in high demand. In 2007, 21.6% of the nation's electricity was fueled by natural gas. Petroleum can also be use...

Inglise keele foneetika ja... - Tallinna Ülikool
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