What is the principle of conservation of energy?
The principle of conservation of energy states that:
1. Energy cannot be created nor destroyed.
2. Energy is only ever transferred from one store to another store.
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Why is energy only useful when transferred?
Useful machines rely on transferring energy from one store (e.g. chemical energy in fuel) to power the machine.
Simply having energy stored in one place does not allow it to do any useful work.
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Explain why most energy transfers are not perfect?
Not all of the energy ends up being put to useful work.
Some of the energy is wasted, typically warming up the surroundings.
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What do the boxes represent in energy transfer diagrams?
In energy transfer diagrams, the boxes represent the different energy stores.
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What do the arrows represent in energy transfer diagrams?
In energy transfer diagrams, the arrows show the direction of energy transfer between the different energy stores.
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