P1

HideShow resource information
View mindmap
  • P1
    • ORIGIN OF THE UNIVERSE
      • Big Bang
        • expansion of the universe
        • only explains expansion, not cause of expansion
        • says the universe should be slowing down expansion now not speeding up as it is
        • cosmogony - björk
    • ELECTROMAGNETIC SPECTRUM
      • radio waves
      • microwaves
      • infrared radiation
      • visible light
      • ultraviolet
      • x-rays
      • gamma rays
      • electromagnetic spectrum song
    • WAVES PROPERTIES
      • reflection
        • angle of incidence = angle of reflection
      • refraction
        • the speed of the wave changes its direction by changing the density it goes through
      • diffraction
        • waves spreading out, the amount it spreads depends on the narrowness of the gap
      • wavelength
      • amplitude
      • frequency
    • ELECTRICITY AND THE NATIONAL GRID
      • distributed by the national grid
      • pylons & transformers
        • step up transformer - increase voltage
        • step down transformer - decrease voltage to not overload building's circuits
    • ENERGY SOURCES
      • renewable
        • wind
        • wave
        • tides
        • hydroelectric
        • solar
        • geothermal
        • biofuel
      • non-renewable
        • bad for the environment, will eventually run out, provide most energy
        • fossil fuels
          • coal, oil, natural gas
        • nuclear
    • COST OF ELECTRICITY
      • numberof units used = power x time
      • cost = numberof units x price per unit
      • energy = power x time
    • EFFICIENCY OF MACHINES
      • efficiency = useful energy out / total energy in
      • efficiency = useful power out / total power in
    • SPECIFIC HEAT CAPCITY
      • energy transferred = mass x specific heat capacity x temperature change
      • how much energy it can store
    • RATE OF HEAT TRANSFER
      • surface area
        • larger = more heat transfer
      • temperature
        • same temperature but smaller volume = cooler quicker
      • material
        • good condctor = more heat transfer
    • ENERGY EFFICIENCY IN THE HOME
      • cavity wall insulation
      • loft insulation
      • draught proofing
      • hot water tank jacket
      • thick curtains
      • payback time = how long it takes for the cost to be made back with savings
      • U Values = how fast heat transfers
        • higher U value = more heat transfer
          • you want lower U values
    • CONDENSATION AND EVAPORATION
      • evaporation = liquid to a gas
        • if they're travelling in the right direction and fast enough
        • makes the liquid cool
      • condensation = gas into a liquid
        • particles slowing down, losing kinetic energy
      • moisture's in the air
      • Untitled
    • CONDUCTION AND CONVECTION
      • where energy is transferred
      • conduction = colliding particles making more heat
      • convention = moving from the hot part to the cold part in a liquid
    • summary

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Everything resources »