P1a Heating houses

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What is the difference between heat and temperature?
Temperature-measure of how hot something is using an arbitrary scale (degrees Celsius). Temperature of an object is a measurement of the average kinetic energy of particles in the object. Heat- a measurement of energy on an absolute scale (joules).
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What does the rate of heating and cooling depend on?
The difference between the temperature of the object and the ambient temperature.
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What does the amount of energy needed to raise the temperature of an object depend on?
The mass of the object, the change in temperature required and the material its made from
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What is specific heat capacity?
Specific heat capacity is the energy needed to raise the temperature of 1kg of material by 1 degree.
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When doesn't the temperature change?
At the point of boiling, melting or freezing.
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What is specific latent heat?
The amount of heat energy required to melt an boil 1kg of material. This depends on the material and the state.
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What are conductors?
Materials that allow energy to flow through them quickly are called conductors, eg. metals.
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What are insulators?
Materials that allow energy to flow through the much more slowly are called insulators, eg. air, wood, plastic and glass.
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Name design features in the home that help save heat loss?
Fibreglass loft insulation, double glazing, cavity wall insulation, reflective foil on walls and draught excluders.
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How does loft insulation reduce heat loss?
It traps layers of air between the fibres, which reduces conduction and convection.
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How does double glazing help keep energy in?
It traps air between the panes of glass and it reduces conduction and convection.
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How does cavity wall insulation prevent loss of heat?
It traps air in the foam. The air prevents conduction and being trapped stops movement and convection.
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Reflective foil on walls, how it prevents heat loss?
By reflecting heat energy back in to the room, and reducing radiation.
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What is energy efficiency?
It is a measure of how good an appliance is at converting input energy into useful output.
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What is conduction?
The transfer of heat energy through a substance, through a hotter region to a cooler region without the substance moving itself.
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What is convection?
The transfer of heat energy by the movement of particles from a hotter region to a cooler one.
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What is radiation?
Hot object emit mainly infra-red radiation, it is an electromagnetic wave which can transfer without a medium.
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Other cards in this set

Card 2

Front

What does the rate of heating and cooling depend on?

Back

The difference between the temperature of the object and the ambient temperature.

Card 3

Front

What does the amount of energy needed to raise the temperature of an object depend on?

Back

Preview of the front of card 3

Card 4

Front

What is specific heat capacity?

Back

Preview of the front of card 4

Card 5

Front

When doesn't the temperature change?

Back

Preview of the front of card 5
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