MATTER AND ENERGY-ELECTRICITY AND MAGNETISM

Self – Testing exercise

1. Briefly explain what is meant by current electricity
2. What are the two forms of current electricity
3. Name three sources of alternating current.
4. How is lightning produced?
5. What is the role of a lightning conductor when safe guarding against lightning?
6. Use an illustration, using a pair of dry cells, a bulb and a wire to show a simple circuit, on it indicate with an arrow the flow of electrons.
7. Identify 3 materials that conduct electricity.
8. Mention 3 substances that are poor conductors of electricity.
9. Why can’t distilled water conduct electricity?
10. Name one non – metallic material that conducts electricity.
11. Name 2 common gases used in an electric bulb.
12. State the importance of each of the following parts of an electric circuit.

dry cell

1. switch
2. fuse

13. How is the function of a fuse different from that of a switch?
14. Which energy change occurs in a bulb when the circuit is complete?
15. Mention the energy change that occurs in a dry cell when the switch is closed.
16. Identify 2 common electrical equipments that use electric energy to produce heat energy.
17. Suggest two common conditions of short circuits.
18. What name is given to the path along which an electric current flows?
19. State two advantages of using electricity for cooking other that wood fuel.
20. Outline two dangers associated with using electricity.
21. Give two domestic appliances that use both electricity and magnetism.
22. Name the two common types of cells
23. There are two major problems that affect the efficiency of wet cells. name them
24. How is a motor different from a generator in function?
25. Name any two companies connected to electricity supply in Uganda today.
26. What is a magnet?
27. Identify 2 examples of magnetic materials
28. Mention 3 examples of non magnetic materials.
29. What do we call the natural magnetic rock?
30. State any 4 properties of magnets.
31. Suggest 4 ways of making magnets.
32. What property of magnetism is shown below?
33. Define the following terms.
34. Magnetic field
35. Demagnetisation
36. Identify 4 uses of magnets
37. How are magnets useful to: –
38. a doctor
39. a watch repair
40. a pilot
41. a person in an iron smelting industry
42. How can the strength of an electro magnet be increased?
43. Identify 2 ways of making a magnet lose its magnetism.