Puzzle

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