1. Personal safety practices • Remove jewelry, watches and rings • Tie hair back and avoid loose clothing • Do not play games in the shop • Be aware of other workers unsafe habits

2. List personal safety practices when working in the shop • Wear safety glasses at all times when in the shop area • Ask when not sure of any procedure • Wear non slip oil resistant soled leather shoes

3. Personal safety practices • Do not wear contact lenses • Do not hesitate to remove yourself from any unsafe environment • Understand the health risks of any chemicals that you are using

4. Personal safety practices • Do not work when intoxicated or taking medications that reduce your alertness • Do not work when you are over stressed or tired • Do not attempt to lift any heavy object without the proper tools or assistance

5. Personal safety practices • Do not work alone • Insure an instructor is present in the lab while you are working on any project.

6. Basic Electrical Theory

7. Define Electricity • The ability to perform “work” by moving electrons between atoms

8. Electron Movement • Heat, light or magnetism is created when electrons move from atom to atom

9. Alternator provides power for running vehicle

10. Alternator provides power for running vehicle

13. Where do electrons come from? • Atoms!

14. What is an atom?

15. an Atom consists of: Electrons Protons and Neutrons

16. Protons and neutrons make up the nucleus

17. Like charges repel each other but the neutrons “glue” the protons in the nucleus

18. Electrons are repelled from each other, but attracted to the protons. Energy (in the form of centrifugal force) keeps the electrons moving in their orbital shell.

22. What is a Volt?

23. Voltage • Electromotive Force (EMF) • the electrical pressure that forces electrons to move from atom to atom • Voltage is present when there is a difference in electrical pressure

24. For Electrons to move between atoms

25. There must be a force to make them leave

26. or a “difference” in electrical pressure

27. These are “balanced” atoms

28. The electrons have no reason to leave the atom

29. An unbalanced atom is an “ion” This ion has a negative charge

30. This ion has a positive charge

31. Opposite

32. Opposite Charges

33. Opposite Charges Attract

34. Similar

35. Similar charges

36. Similar charges repel

37. For current to flow there must be a positive • AND • a negative potential

38. Negative ion Positive ion To have voltage you must have a difference in electrical pressure

39. The electromotive force between ions is calledVOLTAGE

41. Know your Voltmeter • http://us.fluke.com/VirtualDemos/80_series_V_demo.swf

42. Lab #3 Using the Voltmeter