Energy in the place we want it and the form we need it.
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What is wasted energy?
Energy that is not useful energy.
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Where does useful and water energy both end up?
Being transferred to the surroundings, which become warmer.
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What happens as energy spreads out?
It gets more and more difficult to use for further energy transfers.
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What is a machine?
Something that transfers energy from one place to another or from one form to another.
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What does the energy we get out of a machine consist of?
Useful energy which is transferred to the place we and in the form we want it and wasted energy which is not usefully transferred.
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How is energy often wasted by machines?
Because of friction between the moving parts of a machine, this energy warms the machine and the surroundings.
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When is friction useful?
In the brakes of a bicycle or a car some of the kinetic energy of the vehicle is transferred to energy heating the brakes.
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What happens to the wasted energy from a lightbulb?
It is transferred to the surroundings which get warmer.
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Why should we talk about energy being 'wasted' not energy being 'lost'?
Because the law of conservation tells us that energy cannot be destroyed.
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**SOMETIMES WASTED ENERGY IS TRANSFERRED AS SOUND, BUT THE AMOUNT IS USUALLY VERY SMALL. THIS ENERGY WILL ALSO EVENTUALLY BE TRANSFERRED TO THE SURROUNDING AREA**
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