Physics UNIT 1: Energy and Efficiency

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  • Created by: shcoool
  • Created on: 24-05-15 18:50
All objects emit...
... infrared radiation
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The hotter an object is...
... the more infrared radiation it radiates in a given time
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Dark, matt surfaces are...
... good absorbers and good emitters of infrared radiation
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Light, shiny surfaces are...
... poor absorbers, poor emitters and good reflectors of infrared radiation
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Name three ways of energy transfer
convection, conduction, evaporation/condensation
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Name three factors that affect the rate at which an object transfers energy by heating
surface area and volume, the material from which the object is made, the nature of the surface with which the object is in contact
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The bigger the temperature difference between an object and its surroundings...
... the faster the rate at which energy is transferred by heating
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Define payback time
Time taken for something to produce savings to match how much it cost
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How do you measure energy efficiency?
useful energy or power transferred by the appliance/total energy or power supplied to the appliance (*100%)
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What is the conservation of energy?
Energy can be transferred usefully, stored, or dissipated, but cannot be created or destroyed
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Where does wasted energy go?
It is eventually transferred to the surroundings, which become warmer. It becomes increasingly spread out and becomes less energy.
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Other cards in this set

Card 2

Front

The hotter an object is...

Back

... the more infrared radiation it radiates in a given time

Card 3

Front

Dark, matt surfaces are...

Back

Preview of the front of card 3

Card 4

Front

Light, shiny surfaces are...

Back

Preview of the front of card 4

Card 5

Front

Name three ways of energy transfer

Back

Preview of the front of card 5
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