P2 Living for the Future

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Across
  1. 4. the number of waves passing a set point per second
  2. 5. a device that converts kinetic energy into electrical energy
  3. 6. ratio of useful energy output to total energy input
  4. 7. an element used to make semiconductors
  5. 8. device that displays a graph of voltage against time
  6. 10. mixture of gases, mainly nitrogen and oxygen
  7. 11. an electric current that changes direction
  8. 16. the ability to do work
  9. 17. unit of electrical energy, equal to 3,600,000 J
  10. 19. coal, gas, oil are examples
  11. 20. converts Sunlight to electrical energy
  12. 21. boundary between two special types of silicon in a photocell and other components
  13. 22. unit of power
  14. 23. gas that contribute to the greenhouse effect
Down
  1. 1. between microwaves and visible light
  2. 2. particles in fluids gain thermal energy from a warmer region and move into a cooler region, taking the energy with them
  3. 3. increase in the Earth's temperature due to increases in levels of
  4. 5. an electric current that flows in only one direction
  5. 9. the rate that a system transfers energy
  6. 12. energy that can be replenished at the same that it's used
  7. 13. changes alternating current of one voltage to alternating current
  8. 14. waste wood and other natural materials that are burned in power stations
  9. 15. a unit of energy
  10. 17. 1000 watts
  11. 18. changes linear kinetic energy to circular kinetic energy
  12. 21. converts light to electrical energy