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