Water seems to just be the right tool for the job in many applications. It always seemed funny to me that we have not found a better option to generate electricity over the years. Most large scale generators, no matter how complex, is just using something to heat up water and spin a really big fan in order to spin a really big magnet.
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It really depends on what the actual source of energy driving the turbine is. In this case of those driven by stream, that steam comes from heat, either by burning fuel or a nuclear reactor. Turbines driven by water are usually found in dams, where gravity is the driving force pushing the water through the turbine. When energy changes state there’s generally some loss due to inefficiency, so fewer steps along the way means more efficiency.
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