IGCSE Physics- Dynamos and Transformers

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1. In a TRANSFORMER an alternating _______ is applied to the primary coil. This causes an alternating magnetic field to be set up in the core. Because the secondary coil is within the magnetic field it induces an alternating _______. What is the missing word

  • voltage
  • current
  • charge
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Other questions in this quiz

2. In a GENERATOR the brushes connect the spinning slip rings to

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

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

  • the same amount
  • less
  • more

4. A voltage is produced when

  • a soft iron bar moves in a coil of wire
  • a magnet moves in a coil of wire
  • a magnet touches a coil of wire

5. Why do the national grid use transformers to REDUCE THE CURRENT?

  • When a large current flows through a wire it reduces the speed of transfer of electricity
  • When a large current flows through a wire lots of energy is lost as heat
  • Large currents cost a lot of money to create

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