Puzzle

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Across
  1. 3. a type of energy
  2. 4. an arrangement of numbers in a pattern used for solving mathematical problems
  3. 7. an apparatus for reducing or increasing voltage of alternating current
  4. 9. substance in the gas state
  5. 11. an instrument which use to find direction
  6. 13. a flow of electron due to a potential different
  7. 14. a type of polymer used to make non-stick pans
Down
  1. 1. energy that flows from a high temperature body to a low temperature body
  2. 2. react with acids and produce hydrogen gas
  3. 5. allows current to flow in one direction
  4. 6. an equipment use to masseur the pressure
  5. 8. subatomic particle with negative elementary electric charge
  6. 10. water in solid state
  7. 12. positive particle of matter that is part of the nucleus of an atom