water , gravitational potential energy

samedi 30 novembre 2013

Hello , I was thinking about dams and hydroelectrostations , the turbines can turn because the water before the dam is higher than after it so there is stored potential energy waiting bto be released, Now I wonder if we were to take two places one at the water surface level in the dam reservoir and the other at the deepest place at the bottom of the reservoir , from which of these two places would the outcoming water have more energy , from the bottom where all the water above it pushes on the water and so the pressure builds up or from above where the water would fall all the height of the dam and gain it's kinetic energy and then end up where the bottom of the reservoir would be at the other side ?



I kinda think that water which comes from the bottom of the dam reservoir has higher potential energy due to all the water above it exerting a pressure on it than water which falls from the top of the reservoir over the dam, what do you think?






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