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# P2b Powerstation 1

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### Transcript

• 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