P2b Powerstation 1
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  • 1. P2b - Power stations 1
  • 2. P2b - Power stations 1
    • What’s in P2b?
    • How to turn kinetic energy into electrical energy
    • What alternating current (AC) is
    • How power stations work
    • How to calculate power station efficiency
    • How electrical energy is distributed by the national grid
  • 3. Kinetic energy  electrical energy
    • Dynamo effect:
    • You can generate electricity by moving a __________ past a coil of wire or vice versa
    • This is called the __________ effect
  • 4. Dynamo effect
    • The voltage produced can be increased in 4 ways:
    • 1.
    • 2.
    • 3.
    • 4.
  • 5. Generators
    • Generators
    • Use __________ effect to generate electricity
    • Contain electromagnets , which consist of coils of wire wrapped around ________ cores
  • 6. Alternating current (AC)
  • 7. Direct current (DC)
  • 8. Inside a power station
  • 9. Inside a power station
  • 10. Inside a power station
  • 11. Power station energy transfers
    • Start -
    • Finish -
  • 12. Power station efficiency
    • The efficiency of a power station can be calculated using this equation:
  • 13. Try these efficiency questions:
    • How efficient are the following power stations:
    • 60 J wasted for every 40 J of electricity?
    • 200 J electricity from every 500 J fuel?
    • 500 J from every kJ of fuel?
    • 100 J heat energy wasted per 2 kJ of electricity produced?
  • 14. The national grid
    • The national grid is a transmission network that transfers electricity from power stations to our homes
    • Power stations produce electricity at a relatively low voltage
    • Transmission wires carry high voltage (100 000 V +)
    • The mains voltage that we use is 230 V
    • Devices called transformers are used to change the voltage
  • 15. National grid diagram