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由于月亮和太阳对地球引潮力的作用,使占地球表面约71%的海洋里的海水,不断地作周期性的往复运动,海水时而涨到岸边,时而远离海岸。当海水汹涌而来,水位逐渐升高时,就把大量的动能转化为位能;当海水奔腾而去,水位逐渐下降时,位能又转化为动能。海水的这种涨落运动,称为潮汐,它所包含的动能和位能称为潮汐能。早在十一世纪,人们就利用潮汐的动能来磨粉;本世纪五十年代起,
Due to the moon and the sun’s contribution to the tidal force of the earth, seawater in the ocean, which accounts for about 71% of the earth’s surface, is constantly cyclically reciprocating. The sea sometimes rises to the shore and sometimes away from the coast. When the sea water surges and the water level rises gradually, a great deal of kinetic energy is converted into potential energy. When the sea water runs off and the water level gradually drops, the potential energy is converted into kinetic energy again. This fluctuation of seawater movement, known as the tide, it contains the kinetic energy and potential can be called tidal energy. As early as the eleventh century, people use the kinetic energy of the tides to grind powder; since the fifties of this century,