It’s shocking!

1. It’s shocking! Year 10 Electricity topic.

2. Post box activity. • Complete the 8 questions around the room.

3. What is electricity?

4. Name three areas from where we get our electricity.

5. Give five uses of electricity in our homes.

6. Name two materials that are good conductors of electricity.

7. Name a material that is a good insulator of electricity.

8. What is the function of a fuse?

9. What do these symbols represent? A

10. Why does a light bulb glow when you switch it on?

11. Two types of electricity. • Static • Current Brainpop ‘electricity’

12. Static electricity • Static electricity is formed when two materials rub together and some electrons are transferred. • The material which loses electrons becomes positive. • The material that gains electrons becomes negative. Wool +ve - - Plastic -ve

13. Charged materials. Attract Repel +ve -ve +ve +ve

14. Van Der Graaf. • Creates 2 opposing charges in the dome & wand.

15. Coulomb. • The strength of a charge is measured in coulombs (C). • It is defined as the charge transported by a steady current of one ampere in one second.

16. Quick quiz. • Current electricity. • Conductor or insulator?

17. e e e e Current electricity • Current electricity is the movement of electrons through a conductor. • Electrons move from a negatively charged area to a positively charged one.

18. Conductors. • Conductors must have delocalised electrons, that is electrons which are free to move between atoms. Conductor (metal or graphite)

19. Conductor or insulator? • Test some materials and determine whether they are conductors or insulators. • Create a table to put your results in.

20. Why do some materials conduct? • Metallic elements want to give away electrons from their outer shell, (we know this because they make positive ions). • The electrons are not held tightly to the nucleus and are thus free to move between atoms- they conduct electricity. • Non- metals want to take electrons (making negative ions) so they will not conduct electricity (except graphite).

21. Conductors Insulators Properties

22. Flex. • Copper wires covered in plastic…why?

23. Cell Battery Wire Circuit symbols.

24. Wire joined Wires crossing Circuit symbols.

25. Lamp Switch Circuit symbols.

26. Ammeter Voltmeter V Circuit symbols. A

27. Diode Fuse Circuit symbols.

28. Resistor Variable resistor (rheostat) Circuit symbols.

29. Memory • Play the game of electronic memory in pairs/three’s, to help you learn the symbols.

30. Ratu 1st Whiringa-a-rangi • Keywords & Mark Ex 22.01. • Components; What do they do? • Drawing circuit diagrams.

31. V Quiz 1 2 3 4 5 6 7

32. How electrical components work?

33. Drawing circuit diagrams • Draw circuit diagrams in pencil, using a ruler. • All wires are drawn as straight lines. • All components are drawn with a ruler or a compass. • Ensure the cell is drawn the correct way round.

34. A V Draw this circuit.

35. Draw this circuit.

36. Answer V A

37. Keywords 815 (8). • Mark Ex 22.01 • Finish making circuit. • Drawing circuits activity & worksheet. • Homework; Learn symbols.

38. Build this! V A

39. Activity: worksheet. • Walk around the lab and draw the 4 circuits that have been prepared for you. • Now build the 4 circuits on your worksheet.

40. Circuit 1 A

41. Circuit 2 A V V

42. Circuit 3

43. Circuit 4 V

44. Circuit 5 Very bright bulb.

45. Circuit 6 Bright bulb 1, dimmer bulb 2. 1 2

46. Circuit 7 Bright bulb 1, dimmer bulb 2, dim bulb 3. 1 3 2

47. Circuit 8 Very bright bulbs.

48. Circuit 9 Very bright bulbs.

49. Full keywords 115. • Mark ex 92. • Advanced making circuit. • Homework; Ex 93

50. Activity: advanced circuits. • Build the 3 advanced circuits. • REMEMBER they must be checked before you switch them on!!