Electricity and the national grid

  • Created by: jaaaz_v
  • Created on: 10-06-15 11:55
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  • Electricity and the National Grid
    • The national grid takes energy from power stations to where its needed (homes and industries)
      • Power can be generated anywhere on the grid, and supplied to anywhere else on the grid
    • The national grid needs to transmit huge amounts of power
      • Either with a high voltage or high current
      • Too much energy is lost as heat using high currents
      • Cheaper to increase the voltage and keep the current low
    • Transformers and pylons help to keep the voltage high
      • Transformers step the voltage up at one end and step it down at the other end
      • Step-up transformer to increase the voltage for efficient transmission
      • Step-down transformer to reduce the voltage so its safe and at usable levels
    • Overhead cables
      • Step up cost is lower
      • Lots of maintenance needed
      • Easy to access faults
      • Looks ugly and is effected by weather
      • Minimal disturbance to land and easy to sett up
    • Underground cables
      • Set up costs are high
      • Minimal maintenance
      • Hard to access faults
      • Not affected by weather and is hidden
      • Hard to set up and lots of disturbance to lans
    • Supply and demand
      • National grid needs to supply and generate all of the energy we need
      • Our energy demands keep increasing
        • National grid will need to increase energy supplied or we will need to decrease our energy demands
      • Supply can be increased by opening more power plants
      • Demand can be reduced by us using more energy efficient appliances


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