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Doc Brown's GCSE OCR Gateway Science-Physics Revision Notes

OCR GCSE Gateway Science Physics Module P6 Electricity For Gadgets

Unit-Items P6f Generating

  1. Electricity is a very convenient energy source which allows us to use the everyday appliances at home, school and work.

  2. As well as being convenient it is readily available, easy to use, versatile and clean at the point of use.

  3. This unit develops ideas about how electricity is generated.

  4. Suggested practical and research activities you might have done to revise from

    • Demonstrating the induction effect using a strong magnet and a wire.

    • Using a coil and a strong magnet, show the effect of increasing the number of turns and changing the relative motion of the magnet and coil.

    • Building a model generator.

    • Examining and researching the differences between a model generator and a generator in a power station.

    • Examining ways in which the electrical output from a generator can be increased.

    • Comparing the voltage output of AC and DC generators using a cathode-ray oscilloscope (CRO) and investigate how rotation speed affects the output.

  5. Be able to describe and recognise the dynamo effect:

    • electricity can be generated by:

      • moving a wire near a magnet

      • moving a magnet near a wire.

  6. Be able to label a diagram of an AC generator to show the coil, magnets, slip rings and brushes.

  7. Be able to describe a generator as a motor working in reverse.

  8. Be able to explain why electricity is useful:

    • enables energy to be easily transmitted over long distances

    • enables energy to be stored for future use.

  9. Know that in the UK, mains electricity is supplied at 50 Hz.

  10. Understand that a voltage is induced across a wire when the wire moves relative to a magnetic field.

  11. Understand that a voltage is induced across a coil when the magnetic field within it changes.

  12. Be able to describe the effect of reversing the direction of the changing magnetic field.

  13. HT only: Be able to explain how the size of the induced voltage depends on the rate at which the magnetic field changes.

  14. Be able to explain why the rotation of a magnet inside a coil of wire induces an alternating current.

  15. Know that electricity is generated in a power station when an electromagnet rotates inside coils of wire.

  16. Be able to describe how changing the speed of rotation of the electromagnetís coil(s) affects the size and frequency of the voltage generated.

  17. Be able to describe how changing the number of turns on the electromagnetís coil(s) affects the size of the voltage generated.

  18. HT only: When provided with a diagram, explain how an AC generator works including the action of the slip rings and brushes.

 

 

 

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