Physics

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  • Created by: Baharekh
  • Created on: 06-06-15 22:16
What are the 3 ways that energy can be transferred by?
Radiation, conduction, convection
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Heat radiation is the transfer of heat energy by...
Infrared radiation
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Conduction is the main form of heat transfer in...
solids
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Convection is the main form of heat transfer in...
liquids & gases
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Where is infrared radiation emitted from?
Surface of an object
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The hotter the object...
the more radiation it radiates
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What type of surfaces absorb infrared radiation?
Dark, matt surfaces
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What do light, shiny surfaces do?
Reflect infrared radiation
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What is conduction?
The process where vibrating particles pass on kinetic & heat energy to other particles.
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Why does heat energy travel fast in metals? (conduction)
Because metals are good heat conductors.
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What is convection?
When the more energetic particles move from the hotter region to the cooler - and take their heat energy with them.
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Why does hot water rise? (convection)
It has a low density.
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Describe the immersion heater (convection)
Water heats by the heater coils & hot water rises as it is less dense.The hotter water rises above the cooler water & displaces the colder water making it sink towards the heater coils.Convection currents take place circulating heat energy through wa
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What is condensation?
Gas turns to liquid.
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Describe condensation
.
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What is evaporation?
Liquid turns to gas.
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Describe evaporation
.
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The rate of evaporation will be faster if...
1) Temp is higher 2) Surface area is larger
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The rate of condensation will be faster if...
1) Density is higher 2) Temp of the gas is lower
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Explain how vacuum flasks limit heat transfer
1) Glass bottle is double walled with a vacuum, stops conduction & convection through the sides. 2) Walls are silvered to keep heat loss by radiation to a minimum. 3) Bottle supported using insulated foam, minimises heat conduction to or from the out
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Types of heat transfer in homes
1) Loft insulation: Thick layer of fibreglass wool laid across the loft floor & ceiling which reduces heat loss by conduction & convection. Cavity wall insulation: Foam squirted into gaps between bricks reducing convection & radiation.
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Electrical devices eg. tv
Electrical energy = Light, sound, heat energy
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Batteries
Chemical = Electrical & heat energy
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Electrical generation eg. wind turbines
Kinetic = Electrical & heat energy
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Potential energy eg. bow & arrow
Elastic potential energy = Kinetic & heat energy
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Other cards in this set

Card 2

Front

Heat radiation is the transfer of heat energy by...

Back

Infrared radiation

Card 3

Front

Conduction is the main form of heat transfer in...

Back

Preview of the front of card 3

Card 4

Front

Convection is the main form of heat transfer in...

Back

Preview of the front of card 4

Card 5

Front

Where is infrared radiation emitted from?

Back

Preview of the front of card 5
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