P2b Powerstation 1

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P2b Powerstation 1

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

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