Electricity

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  • Electricity
    • Types
      • wind
        • advantages
          • environmentally friendly
          • never runs out
        • disadvantages
          • not reliable
          • visual pollution
      • tidal
        • advantages
          • never runs out
          • environmentally friendly
        • disadvantages
          • prevents access by boats
          • alters habitat- flooding
      • solar
        • advantages
          • cost effective and reliable
          • no pollution
        • disadvantages
          • only reliable during the day
          • initial cost are high
      • nuclear
        • advantages
          • provides lots of  energy
          • doesn't rely on weather
        • disadvantages
          • runs out
          • damages environment
      • biomass
        • advantages
          • relatively quick
          • natural source
        • disadvantages
          • habitats lost
          • burning vegetation increases CO2 levels
      • geothermal
        • advantages
          • no environmental problems
          • free energy
        • disadvantages
          • only in volcanic areas
          • expensive power plant
      • wave
        • advantages
          • no fuel costs
          • no pollution
        • disadvantages
          • visual pollution
          • hazard for boats
      • fossil fuels
        • advantages
          • provides lots of energy
          • doesn't rely on weather
        • disadvantages
          • non renewable
          • damages environment
      • hydroelectric
        • advantages
          • reliable
          • creates electricity quickly
        • disadvantages
          • ruins landscape
          • flooding
    • Energy forms examples
      • Kettle electrical------> heat+sound
      • torch chemical-----> light+heat
    • Efficiency
      • efficiency= useful out __________ total in
      • useful= total x efficency
    • Power
      • energy= power x time
      • power=   energy ________ total
    • National Grid
      • electricity pylons
        • why are they overground
          • cheaper and easier to fix
          • easier to build
          • easier to avoid gas/water pipes
          • gets over river, canals
        • why are they underground
          • safer for fishers and kits
          • no visual pollution
      • Step up transformers increase voltage and decrease current, so not as much energy is wasted by heat
  • Step up transformers increase voltage and decrease current, so not as much energy is wasted by heat

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