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

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

7. Generators induce a current by

  • spinning a magnet inside a coil of wire
  • Either
  • spinning a coil of wire inside a magnetic field

8. Electrical power =

  • Current * resistance
  • Voltage * current
  • Voltage / current

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

  • having more turns and an iron core in the coil
  • increase the current through the wires
  • turning the magnet/coil faster
  • using a magnet with a stronger magnetic field

10. How do we find the direction of movement, magnetic field and current in a generator?

  • Use the RIGHT hand grip
  • Use Fleming's RIGHT hand rule
  • Use Fleming's LEFT hand rule

11. A voltage is produced when

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

12. A bicycle dynamo is an example of

  • a generator
  • a motor
  • a magnet

13. Is mains electricity AC or DC?

  • AC
  • DC
  • depends on the type of generator it was produced in

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

  • Alternating current
  • Direct current
  • both

15. 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