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12 Cards in this Set
- Front
- Back
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What are good conductors of energy? |
Metals |
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What are the best insulators? |
Non-metals such as wool and fibreglass |
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What does the energy transfer through conduction in a material depend on? |
Its thermal conductivity |
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The greater the thermal conductivity, the...? |
Higher that rate of energy transfer through it. |
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What do good insulators need to have? |
- Low thermal conductivity so energy transfer is as low as possible. |
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The energy transfer per second through a layer of insulating material depends on: |
- temperature difference across the material - thickness - thermal conductivity |
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What is the equation for specific heat capacity? |
Energy transferred = mass * specific heat capacity * temperature change ∆E = m * c * ∆ø |
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What is specific heat capacity? |
The amount of energy needed to change the temperature of 1kg of the substance by 1°C |
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If the mass of an object is greater, how does this effect temperature increase? |
The temperature increases slower when it is heated. |
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Suggest some ways the rate of energy transfer from houses can be reduced. |
- loft insulation - cavity wall insulation - double glazed windows - aluminium foil behind radiators - external walls with thicker bricks |
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What is cavity wall insulation? |
Insulation material that is used to fill the cavity between the two brick layers of an external house wall. |
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What are some ways that houses are actively heated? |
- Electric and/or gas heaters - Gas or oil fired central heating - Solid fuel stoves |
