Physics P1.2

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  • Created by: Matty_G16
  • Created on: 20-05-16 10:27
What form of energy does a compressed spring have?
Elastic potential energy.
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Where does the chemical nergy stored in your muscles come from?
From the food that you eat.
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What energy transfer takes place when you turn on a torch?
Chemical to electrical to light and transfer by heating.
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In terms of energy, what happens when you burn a fuel?
Chemical energy in the fuel is transferred to transferred to the surroundings which get warmer.
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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' not being 'lost'?
Because the law of conservation tells us that energy cannot be destroyed.
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In a light, bulb for every 25 joules of energy that are supplied to the bulb, 5 joules are usefully transferred into light energy. What is the efficiency of the bulb?
The efficiency is 0.2 or 20%.
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A machine is adjusted so that if wastes less energy because of friction. What happens to the efficiency of the machine?
The efficieny increases.
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Other cards in this set

Card 2

Front

Where does the chemical nergy stored in your muscles come from?

Back

From the food that you eat.

Card 3

Front

What energy transfer takes place when you turn on a torch?

Back

Preview of the front of card 3

Card 4

Front

In terms of energy, what happens when you burn a fuel?

Back

Preview of the front of card 4

Card 5

Front

What happens to the wasted energy from a light bulb?

Back

Preview of the front of card 5
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