Useful Energy

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What is a machine?
A machine is something that transfers energy from one place/form to another
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What is useful energy?
Energy which is transferred to the place we want it and in the form we want it.
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What is wasted energy?
Energy which is not usefully transferred
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What happens to the wasted energy from a light bulb?
It is transferred to the surroundings which get warmer
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Why should we talk about energy being 'wasted' and not 'lost'?
Because the law of conservation tells us that energy can not be destroyed
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Why is energy often wasted?
Energy is often wasted because of friction between the moving parts of a machine. It becomes more difficult to use for further energy transfers.
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Where is friction useful?
Bicycle or car brakes.
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Other cards in this set

Card 2

Front

What is useful energy?

Back

Energy which is transferred to the place we want it and in the form we want it.

Card 3

Front

What is wasted energy?

Back

Preview of the front of card 3

Card 4

Front

What happens to the wasted energy from a light bulb?

Back

Preview of the front of card 4

Card 5

Front

Why should we talk about energy being 'wasted' and not 'lost'?

Back

Preview of the front of card 5
View more cards

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