Puzzle

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