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Electromagnetic Induction

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Electromagnetic Induction

Electromagnetic Induction

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  • 1. Electromagnetic Induction
    • If a magnet is moved into a coil of wire a current is induced in the wire.
    • If the magnet is moved out of the coil the direction of the current is reversed
    • A wire, or coil of wire, cutting through a magnetic field will generate a voltage. This induced voltage causes a current to flow through the wire
    Electromagnetic Induction
  • 2. Electromagnetic Induction Electromagnetic Induction
  • 3. Electromagnetic Induction Electromagnetic Induction
  • 4. Electromagnetic Induction Electromagnetic Induction
  • 5. Electromagnetic Induction Electromagnetic Induction
  • 6. Electromagnetic Induction Electromagnetic Induction
  • 7. Increasing the voltage
    • The size of the induced voltage can be increased if;
    • the wire is moved faster
    • the magnet is stronger
    • the number of turns on the coil is increased
    • the area of the coil is greater
    Increasing the voltage
  • 8. Increasing the voltage Increasing the voltage
  • 9. Increasing the voltage Increasing the voltage
  • 10. Generators and Dynamos
    • Electricity is generated by rotating a coil of wire in a magnetic field or by rotating a magnet inside a coil of wire. This is how a generator works
    Generators and Dynamos
  • 11. Generating Electricity Generating Electricity
  • 12. Generator Generator
  • 13. Dynamo Dynamo
  • 14. Transformers
    • Transformers can be used to change the voltage of an a.c. supply.
    • A changing magnetic field in the primary coil induces a voltage in the secondary coil
    • Transformers only work with alternating voltage
    Transformers
  • 15. Transformers Transformers
  • 16. Transformers
    • Step-up transformers produce high voltages so that little energy is lost in power lines (National Grid)
    • Step-down transformers reduce voltages before the electricity reaches our homes
    • Primary voltage/Secondary voltage = Number of turns on primary/Number of turns on secondary
    Step-up & Step-down Transformers
  • 17. Transformers Step-up & Step-down Transformers
  • 18. Step up transformer Step up Transformer
  • 19. Step down transformer Step down Transformer
  • 20. Wordsearch Wordsearch
  • 21. Quiz Quiz