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Summary GCSE Physics (AQA) revision notes for energy resources topic
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Most Kids Hate Learning GCSE Conservation of energyEnergy Names • Energy can be transferred
• Magnetic usefully, stored or dissipated
• Kinetic (movement energy) • Energy cannot be created or
• Heat (thermal energy) destroyed
• Light • Wasted energy is eventually
• Gravitational potential transferred to the
• Chemical surroundings which become
• Sound warmer and the energy
• Electrical becomes increasingly spread
• Elastic potential out and so becomes less
• Nuclear useful
PREVENTING HEAT LOSS EFFICIENCY = Useful energy output x100
• Loft insulation to reduce energy Total energy input
transfer by conduction
• Cavity wall insulation – traps air
in small pockets prevents
convection Energy
transferred
• Aluminum foil between radiator (kWh / J)
and wall to reflect infrared
radiation back into the room Power (J/s/W)×Time (s/hrs)
(kW)
• Draught excluder to reduce
energy transfer by convection
• Double glazed windows act as
U VALUES
insulation, vacuum and reduces
How much energy per second
convection.
passes through a material across
1m2 when temperature difference
Sankey diagrams is 1°C
The energy transfer through an • U-values measure how
appliance can be represented with a effective an insulator a
Sankey Diagram material is
• The lower the U value the
better the material is as an
insulator
• Knowing the U value of a
material allows for
comparison
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