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If
something changes, there is energy
there.
A plant
grows, the gas in a cigarette lighter burns, the air moves the wind
turbines, the sun heats up the sea, etc. etc... Energy is
involved in all of these processes.
A fundamental property of energy is that it is transmitted from some bodies to
others without anything being lost: energy is neither created nor
destroyed, it is transformed!
The picture shows some transformations of energy.
The energy from the sun passes to plants, to oil, to coal, to animals
and to human beings; they take advantage of it by using the energy from
oil, animals, coal, etc.
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