GCSE: Physics

I GOT ALL THIS INFORMATION OUT OF MY CLASSWORK BOOK AND NOTES. ITS NOT COMPLETE BUT WHEN I GET NOTES ON ELECTROMAGNETIC SPECTRUM I WILL UPDATE IT :D

chelly. xxxx

HideShow resource information
View mindmap
  • GCSE: Physics
    • Generating electricity
      • Sources of energy
        • NON-RENEWABLE:coal, oil and gas
        • RENEWABLE:hydro-electric, nuclear, wind
      • Efficiency: fossil fuel power station approx. 40% efficient. Wind turbine is approx. 50% efficient
    • Transmission of electricity
      • Power stations generate around 30,000v
        • it is then increased using a step up transformer to around 275,000v.
          • carried around the national grid to supply  demands, then reduced by step down transformer to around 230v (in britain)
      • National gird! network of wires and cab els above and below ground connects to power stations ad homes
      • power= voltage X current (w= v X a)
        • E.G, find the power of an iron that has a current of 4A and voltage 230v . You should get 920v
    • Energy supply and the home
      • energy (j)= power (w) X time (s)
        • cost= cost per unit x no of units
    • Energy Transfer
      • conduction:mainly happens in solids because the particules are tightly packed. Particles get heated up and start to vibrate.
        • good conductors: metal.
      • convection: happens in liquids and gases. it needs the particles to move.
      • Radiation: does not need particles for the heat to travel through.
        • Black matt surfaces absorb & admit heat. Shiny white surfaces reflect and are poor absorbers and poor emitters,
    • Waves and the electromagnetic spectrum
      • waves: characteristics of waves. we have two types of waves: longitudinal and transversal
        • longitudinal: need something to travel through. it compresses the particles. Sound is a an example.
        • Transversal: dont need anything to travel through. light is an example.
        • frequency measured in hz. amplitude. wavelengthmeasured in metres. wavespeed=frequencyx wavelength
  • EDEXCEL

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Electricity resources »