Mohammed's Technology Crossword

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Across
  1. 1. a plastic polymer which becomes more soft when heated and hard when cooled
  2. 4. unit of electrical resistance
  3. 8. the rate of flow of electric charge
  4. 9. a first or preliminary version of a device or vehicle from which other forms are developed
  5. 11. a principle or standard by which something may be judged or decided
  6. 13. close-fitting glasses with side shields, for protecting the eyes from glare, dust, water, etc
  7. 14. a thermoplastic resin used to make beverage, food and other liquid containers, synthetic fibers as well as for some other thermoforming applications
  8. 16. the condition of being protected from danger or risk
  9. 17. convert waste into a reusable material
  10. 18. a light-emitting diode
  11. 19. a word used to describe an action
  12. 20. the natural purpose (of something) or the duty (of a person)
  13. 22. a rough or unfinished drawing
Down
  1. 2. a protective garment worn over the front of ones clothes and tied at the back
  2. 3. a closed loop which electrons can travel in
  3. 5. a thermoplastic of high density
  4. 6. a plan or drawing to show an outline of an idea.
  5. 7. a tool or machine with a rotating cutting tip or reciprocating hammer or chisel, used for making holes
  6. 10. an electromotive force
  7. 12. an electric device that increases electrical signals
  8. 15. a stable subatomic particle with a charge of negative electricity
  9. 16. a fusible metal alloy used to bond work pieces
  10. 20. a tool used to remove fine amounts of material from a workplace
  11. 21. the negatively charged electrode by which electrons enter an electrical device
  12. 22. a hand tool used in metal work to mark lines on work pieces