GCSE AQA Physics 1 Energy & Efficiency

Lilac Potato
Mind Map by , created about 3 years ago

Mind map showing information about efficiency in the home, specific heat capacity, energy transfer, efficiency of machines & cost of electricity.

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Lilac Potato
Created by Lilac Potato about 3 years ago
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1 In the home
1.1 Most effective insulation - biggest annual saving
1.1.1 Eventually money saved = initial cost
1.2 Most cost-effective - often cheapest, short payback time
1.3 Cavity wall insulation
1.3.1 Foam in gaps stops convection currents & radiation - insulating foam & air pockets = reduce conduction
1.4 Loft insulation
1.4.1 Fibreglass wool reduces conduction & radiation
1.5 Draught-proofing
1.5.1 Strips around doors to stop draughts - reduce convection
1.6 Hot water tank jacket
1.6.1 Fibreglass wool reduces conduction & radiation
1.7 Thick curtains
1.7.1 Reduce conduction & radiation
1.8 U-Values
1.8.1 Higher = heat travels faster
1.8.1.1 Better insulator - lower value
2 Specific heat capacity
2.1 How much energy something can store
2.1.1 Amount of energy needed to raise temp. of 1kg by 1*C
2.2 Heaters have high SHC
2.2.1 Water ideal for central heating - high SHC, liquid
2.2.1.1 Electric storage heaters - store heat using concrete/bricks
2.2.2 Some filled with oil - lower SHC, not as good but higher boiling point - can safely reach higher temp.
3 Energy transfer
3.1 9 types of energy: electrical, light, sound, kinetic, nuclear, thermal, gravitational potential, elastic potential & chemical
3.2 Energy can be TRANSFERRED from one form to another - but it can never be CREATED or DESTROYED
3.2.1 Energy is only useful when it can be converted
4 Efficiency of machines
4.1 Useful energy / Total energy
4.2 No device is 100% efficient & wasted energy is usually spread out as heat
4.2.1 Less concentrated but total amount is the same - can't easily be used
4.3 Heat exchangers
4.3.1 Pump cool fluid through heat - temp. rises, can convert into useful form
5 Cost of electricity
5.1 kWh - units of energy
5.1.1 Units = Power x Time
5.1.1.1 Cost = Units x Price