P2.5 mains electricity

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Across
  1. 3. number of waves divided by time taken =
  2. 6. the energy an electrical appliance transfers in a second
  3. 7. a case used to keep the wires in a plug safe without needing a earth wire
  4. 8. the current where electrons only move in one direction
Down
  1. 1. current x time =
  2. 2. an earth wire is used to stop any build up of extra
  3. 4. in a direct current, the amplitude is
  4. 5. an electrical cable contains three wires made out of