Energy

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  • Created by: erinboyle
  • Created on: 08-12-13 22:16
Conduction occurs in ...
Solids
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What type of materias are the best conductors?
Metals
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Examples of good insulators are...
Wool and Fibreglass
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What is the main cause of conduction in Metals?
Free Electrons
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Why are non-metals poor conductors?
They don't have free electrons
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Convection occurs in ...
Liquids and Gases
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what is convection?
the circulation of a fluid caused by heating
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what causes convection?
heating a fluid makes it less dense so it rises and circulates
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Radiation is an...
Electromagnetic wave- INFRA RED
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where does radiation occur?
in all objects
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what is a the electromagnetic wave called?
Infra red radiation
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The warmer an object is the...
Greater the amount of Radiation
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The colder an object is the...
Smaller the amount of Radiation
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What type of surfaces are good emitters/absorbers of Radiation ?
Dull & Dark
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What type of surfaces are bad emitters/absorbers of Radiation ?
Shiny & Light
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What type of surfaces are good reflectors of Radiation?
Shiny & Light
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what type of surfaces are bad reflectors of Radiation?
Dull & Dark
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What are U Values?
energy/per second --> 1 square m (when the temperature difference across it is 1° C)
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the lower the U value the...
better the insulator
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payback time =
cost to buy and install ÷ amount saved per year
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specific heat capacity
Q=sm∆t
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specific heat capacity units are
J/Kg °C
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Q=sm∆t is
Energy needed= specific heat capacity x mass x difference in temperature
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Other cards in this set

Card 2

Front

Metals

Back

What type of materias are the best conductors?

Card 3

Front

Wool and Fibreglass

Back

Preview of the back of card 3

Card 4

Front

Free Electrons

Back

Preview of the back of card 4

Card 5

Front

They don't have free electrons

Back

Preview of the back of card 5
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