Industrial Techniques

3. to produce light we used a device called a ___.
5. is energy at work.
7. this part of the tree absorbs sunlight and carbon dioxide from the atmosphere.
8. companies supplying electrical energy measure this energy in a unit called_____.
13. is a process by which melted plastic is formed into useful products.
14. a device that converts chemical energy to electrical energy.
15. these are made from wood that are used for indoor purposes.
17. the term used for the sawing of logs into timber is_____.
19. is the name given to sand/glass paper and emery paper.
20. when two or more metals combined to form one it is called an___.
22. is produced by using water to turn a turbine to produce electricity.
24. are a group of plastics that can be remelted after being form.
25. is a thick, dark liquid trapped between rock or sand under the Earth.
26. this is a type of defect that is found in timber.
28. a dividing layer that makes new cells to help the tree grow.
29. is the opposition to the flow of current.
32. metals which contain iron and rust easily.
33. the youngest wood that is nearest to the outside of the tree trunk.
34. are a group of plastics that cannot be remelted after being form.
36. is a popular natural material used for constructing articles.
37. a device which converts mechanical energy to electrical energy.
38. can be used as mulch around plants.

1. is the ability to do work.
2. involves the movement of small particles called charges.
3. this type of raw material produces aluminum.
4. the process of removing moist from timber is referred to as______.
6. is a solid, burnable substance that is black to brown in colour.
9. used to test squareness of a metal.
10. comes from trees producing broad leaves.
11. is the process of using waste materials to produce articles.
12. this is the most commonly used method for seasoning.
13. are tiny living things that cannot be seen with the naked eye.
16. used to scribe or mark lines on metal.
18. is a synthetic material made from substances called polymers.
21. is energy at rest.
23. this device consists of several blades which are driven by falling water, steam or by the wind.
27. metals which contain little or no iron.
30. is a type of non-ferrous metal.
31. comes from trees producing needles-like leaves.
35. are the materials from which metals are processed.