IGCSE Physics- Dynamos and Transformers

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1. Which of these is NOT a way to increase the induced voltage in a GENERATOR?

  • turning the magnet/coil faster
  • having more turns and an iron core in the coil
  • increase the current through the wires
  • using a magnet with a stronger magnetic field
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2. In a GENERATOR the slip rings are connected to

  • the external circuit
  • the coil
  • the magnetic field where the coil spins inside it

3. Because the induced current switches direction every half turn in a GENERATOR, what type of current is produced?

  • Alternating current
  • Direct current
  • both

4. If a transformer is a STEP-UP transformer, the primary coil will have ____ turns than the secondary coil

  • the same amount
  • less
  • more

5. When a magnet is spun inside a coil in a DYNAMO a potential difference is produced between the two ends of the coil causing a _______ to flow

  • current
  • voltage
  • magnetic field

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