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Level 2

P1.2 Using Energy


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Chemical energy
energy in the form of chemical bonds within a substance
kinetic energy
the energy a moving object possesses
gravitational potential energy
the energy of an object due to its height above the ground.
Elastic potential energy
the energy of an object under strain
electrical energy
energy in the form of movement of electrons
Energy
The ability to do work.
conservation of energy
the principle that energy can be neither created nor destroyed.
useful energy
energy transferred by a machine that is in a form that is needed
wasted energy
energy transferred by a machine that is not in a form that is needed
Newtons (N)
The unit of force.
Sankey Diagram
A split arrow which shows the transfer of energy by a machine.
Input energy
energy supplied to a machine
efficiency
the useful energy provided by a machine divided by the total energy multiplied by a hundred.