Waterwheels - numerous turns of little gear so machine runs...

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Waterwheels 13:48 MOVING Water is able to do work MOVING Water has energy Kinetic Energy- the energy associated with objects or bodies in motion KINETIC ENERGY=WORK Potential Energy- Can possibly do work  Top of waterfall=High Gravitational Potential Energy Bottom of waterfall= Low Gravitational Potential Energy SPONTANEOUS CHANGE  always  occurs from high P.E. to low P.E. We can extract  work  from a spontaneous change We don’t convert K.E. completely(100%) to work A change that goes from low P.E. to high P.E. is NOT spontaneous A non-spontaneous change goes from low P.E. to high P.E. -Have to put energy in the system Vitruvius-first engineer-first waterwheel BIG GEAR TURNED BY WATERWHEEL-Revolution of big gear causes 
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Unformatted text preview: numerous turns of little gear so machine runs faster than water wheel LITTLE GEAR TURNED BY WATERWHEEL-Little gear has to turn around many times to turn big gear once-machine runs slower than water wheel Millstone-Stone turned by waterwheel Advantages of water as energy source 1)Essentially no ignitions (pollution free) 2)No cost for the energy source (only costs are investment in equipment) 3)Very low maintenance 4)Dont have to worry about running out (renewable energy) Disadvantages of water as energy source 1) Affected by seasonal change such as drought or freezing 2) Not every place has adequate locations for using water energy...
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This note was uploaded on 10/18/2010 for the course EGEE 101 at Pennsylvania State University, University Park.

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Waterwheels - numerous turns of little gear so machine runs...

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