GCSE AQA Physics 1 Energy & Efficiency


Mind map showing information about efficiency in the home, specific heat capacity, energy transfer, efficiency of machines & cost of electricity.
Lilac Potato
Mind Map by Lilac Potato, updated more than 1 year ago
Lilac Potato
Created by Lilac Potato over 7 years ago

Resource summary

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