generating electricity

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Clues

  • as the tide comes in it fills up an estuary to a height of several metres. (5, 9)
  • as waves come to the shore they provide an up and down motion which can be used to drive the generator. (4, 5)
  • electricity is generated directly from the wind turning the blades which turns the generator. (4, 5)
  • generate electric currents directly from sunlight. The best source of energy for watches and calculators. (5, 5)
  • only possible in volcanic area where hot rocks lie quite near the surface. (10, 6)
  • requires the flooding of a valley by building a big dam. (13, 5)
  • spare nightime electricity used to pump water up to a higher reservoir. (6, 7)
  • takes electricity from power stations to where it is needed in homes and industry. (8, 4)
  • transformers have to step up the voltage at one end for efficient transmission then bring it back to safe useable levels at the other end. (12)

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