Energy and work

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Across
  1. 5. The power taken from water
  2. 6. The percentage of the useful work of input energy of devices
  3. 7. The problems of thermal power plants
  4. 12. The steam from the boiler rotates ______ to generate electricity
  5. 13. Which fuel is used mostly in thermal power plants
  6. 15. What renewable energy source is from the Earth's interior heat?
  7. 17. The cause of sulfur dioxide emited by coal-burning power plants
  8. 18. Energy is transformed to useful and _____ work
  9. 19. Coal, gas and oil are ______ fuels.
  10. 21. The part of thermal power plant where the steam is produced
Down
  1. 1. Efficiency cannot be ______ percent.
  2. 2. What is the chemical element commonly used in nuclear power plants for generating electricity?
  3. 3. Electricy is made by _________
  4. 4. ________ is released to the air and causes air pollution by thermal power plants
  5. 8. The collection of aerogenerators
  6. 9. What is the energy stored in the nucleus of an atom called?
  7. 10. Tidal, wind and solar energies are ______ energies
  8. 11. What is the process of splitting atoms to release energy called?
  9. 14. The fuel made by plants or animal matters
  10. 16. What is the energy associated with the motion of atoms and molecules in a substance called?
  11. 20. Energy that is not wasted