Puzzle

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