发电机使机械能转换为电。
仅仅利用机械能概念，它是守恒的。
We only used the concept of mechanical energy, which is conserved.
机械能只有在，力是恒定时才恒定。
And mechanical energy is only conserved if the force is a conservative force.
它紧跟着，机械能，守恒定理而产生。
It follows immediately from the conservation of mechanical energy.
机械能是守恒的，因为重力是守恒力。
Mechanical energy is conserved, because gravity is a conservative force.
我要写下整体的，能量守恒，机械能。
I'm going to write down the conservation of total energy, mechanical energy.
在这两种情况中，都是机械能起的作用。
让我们试着用机械能，守恒定律解答一下。
所以总机械能，守恒。
热传递能够改变物体的机械能。
电能可由电动机装换成机械能。
Electrical energy can be changed by electric motors into mechanical.
发电机可以将机械能转变成电能。
The mechanical energy can be changed back into electrical energy by generator.
利用发电机可将机械能转变为电能。
Mechanical energy can be changed into electrical one by means of a generator.
电能和热能一样可以转化为机械能。
Electrical energy as well as heat can be converted into mechanical energy.
要注意，并非所有的机械能都是动能。
发电机将机械能转变成电能。
电动机把电能转换成机械能。
An electric motor turns electrical energy into mechanical energy.
热由此转换成活塞的机械能。
Heat is thereby converted into mechanical energy of the piston.
利用发电机，可以将机械能转变成电能。
The mechanical energy can be turned into electrical one by a generator.
利用发电机，可以将机械能再度成电能。
The mechanical energy can be changed back into electrical energy by a generator.
利用发电机可以把机械能再转变成电能。
The mechanical energy can be changed back into electrical energy by means of a generator.
在流传中我们设法把部分热变成机械能。
During the flow we manage to change some of the heat into mechanical energy.
瀑布是机械能。
发电机把机械能转变成电。
所以，风速的微小增加可导致获得的机械能大幅增加。
So, a small increase in wind speed can lead to a big increase in the amount of mechanical energy you can harvest.
电动机就是把电能变成机械能的一种电机。
An electric motor is that which converts electrical energy into mechanical energy.
利用发电机，可以将机械能再转换成电能。
The mechanical energy can be changed back into electrical energy by means of generator.
流动的水拥有机械能。
还是机械能，守恒。
还是机械能，守恒。
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