Where does the Earth's energy come from?
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So all the energy that exists today has been around since the formation of the Universe.
The Earth's energy comes from heat trapped inside the Earth when it was originally formed, or from energy radiated out from the Sun. We cannot make energy, but we can extract it from coal, oil, fast-flowing rivers, nuclear fuel and various other sources. Even the wind can supply us with a source of energy.
On the move
For centuries people have tried to cheat the laws of physics by inventing perpetual motion machines. These are machines that would run forever without any power, or would produce their own energy. Both types of machine are impossible.AII machines need power to overcome friction and all the other forces that cause machinery to slow down. A law of physics says that energy cannot be created, so any machine that runs continuously must obtain its energy from somewhere else.
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Date Added: 13 December '11
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