electromagnetic induction

• generator effect - when motion between a conductor and magnetic field creates electricity
• alternator - electric generator which produces an alternating current
• dynamo - electrical generator which produces a direct current
• national grid - power station sends electricity to homes through a network of wires and cables
• transformers - step up

  • PD increases
  • current decreases
  • reduces heat / energy loss
• transformers - step down

  • PD decreases
  • current increases
  • safe to use in homes
• step up transformer - how it works

  • less coils on primary coil - around an iron core
  • attaches to an alternating current supply
  • forms an alternating magnetic field
  • forms and alternating potential difference
  • moves to the secondary coil - has more coils