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| In a machine, the ratio of useful energy output to total energy input, or the percentage of the work input that is converted to work output |
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| A devise in which hydrogen and oxygen are compressed at electrodes to produce water and electric current |
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| The pivot point of a lever |
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| The SI unit of work and of all other forms of energy. One joule (symbol J) of work is done when a force of one Newton is exerted on an object move one meter in the direction of the force |
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| Energy of motion, equal to half the mass multiplied by the speed squared |
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| law of conservation of energy |
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| Energy cannot be created or destroyed. It may be transformed from one form into another, but the total amount of energy never changes |
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| A simple machine, made of a bar that turns about a fixed point |
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| A device for increasing (or decreasing) a force or simply changing the direction of a force |
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| The ratio of output force to input force for a machine |
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| The energy due to the position or the movement of something; potential or kinetic energy (or a combination of both) |
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| Energy of position, usually related to the relative position of two things, such as a stone and Earth, or an electron and a nucleus |
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| A type of lever that is a wheel with a groove in its rim, which is used to change the direction of a force exerted by a rope or cable. A pulley or system of pulleys can also multiply forces |
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| The SI unit of power. One watt is expended when one joule of work is done in one second |
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| The product of the force on an object and the distance through which the object is moved (when force is constant and motion is in a straight line in the direction of the force); measured in joules |
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| The theorem that states that whenever work is done, energy changes |
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