P5 Electricity in the Home

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Across
  1. 3. transformers and cables make up what is known as the 'national ____'
  2. 6. mains electricity supplies a potential difference of two hundred and ______ V
  3. 7. How good a device is at transfers energy usefully
  4. 9. rate of flow of charge through a circuit, measured in amps
  5. 13. brown: brings current into the device
  6. 14. device in plugs that can break the circuit if current exceeds a specific limit
  7. 15. The number of pins a UK plug has
  8. 17. unit for energy
  9. 18. The name of the electricity type that flows into consumers from the national grid
  10. 20. unit for potential difference
  11. 21. unit for power
Down
  1. 1. yellow and green: safety mechanism, prevent the device from the going live if there is a fault
  2. 2. mains electricity supplies a frequency of ______ Hz
  3. 4. type of current that only flows in one direction
  4. 5. How quickly energy is transferred, measured in Watts
  5. 7. = power x time, measured in joules
  6. 8. part of the national grid that transports the current between transformers
  7. 10. Step ___ transformer: will increase P.D and decrease current
  8. 11. a device capable of changing the current and potential difference in the national grid
  9. 12. blue: completes the circuit, bringing current out of the device
  10. 16. Step ___ transformer: will decrease P.D and increase current
  11. 19. type of current that repeatedly reverse direction