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2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
2.11 producing electrical_energies_batteries
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2.11 producing electrical_energies_batteries

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BTEC Level 2

BTEC Level 2

Published in: Education
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Transcript

  • 1. 2.11 Producing electrical energies: non-renewable sources January 4, 2011
  • 2.  
  • 3.  
  • 4. Key terms
    • Non-renewable energy sources : energy sources that cannot be replaced easily, for example fossil fuels
    • Main electricity : electricity that comes into our homes and places of work. The voltage is normally 230 V and the frequency is 50 Hz
  • 5.  
  • 6. Power stations
    • Most power station produce electricity by heating water to create steam. This steam is used to turn turbines which rotate a generator to produce electricity
    • This electricity is then sent to our homes through the national grid
    • The water is often heated by non-renewable energy sources
  • 7. Fossil fuels
    • The efficiency of most power stations is 30% although with newer technologies we can reach 50%.
    • When they burn carbon dioxide is produced
  • 8. Nuclear power
    • In a nuclear power station, energy given out during nuclear reactions is used to heat water to steam.
    • No burning of fuel occurs so no carbon dioxide is produced
    • It does produce radioactive waste which lasts for thousands of years
  • 9.  
  • 10. Producing electricity – ac generators
    • Electrical generators use induction to supply electricity. The turbine that is turned by the steam created in the power station boilers rotates a generator which is a large coil of wire between magnets.
    • The magnetic field induces a current in the coil
  • 11.  
  • 12.  
  • 13. Science focus
    • The current produced by an ac generator can be increased by:
      • Using stronger magnets
      • Rotating the coil faster
      • Increasing the number of turns of wire in the coil
      • Making the coil thicker
  • 14. Mains electricity
    • The electricity supply in our homes is an alternating current with a frequency of 50 Hz
    • This means the current changes direction 50X every second, this is faster than we can see
    • Everything is turning on and off 50X a second but we never notice!
  • 15.  
  • 16.  
  • 17. To do
    • Mary is a trainee engineer working for an electricity company. Part of her job involves inveigating ways to make the electricity generators more efficient.
    • Make a list of all the areas in a power station where energy may be wasted and the ways that these losses may be reduced

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