Presentation on theme: "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."— Presentation transcript:
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
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
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
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
Personal safety practices Do not work alone Insure an instructor is present in the lab while you are working on any project.
Basic Electrical Theory
Define Electricity The ability to perform “work” by moving electrons between atoms
Electron Movement Heat, light or magnetism is created when electrons move from atom to atom
Alternator provides power for running vehicle
Where do electrons come from? Atoms!
What is an atom?
an Atom consists of: Electrons Protons and Neutrons
Protons and neutrons make up the nucleus
Like charges repel each other but the neutrons “glue” the protons in the nucleus
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.
What is a Volt?
Voltage E lectromotive 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
For Electrons to move between atoms
There must be a force to make them leave
or a “difference” in electrical pressure
These are “balanced” atoms
The electrons have no reason to leave the atom
An unbalanced atom is an “ion” This ion has a negative charge
This ion has a positive charge
Opposite Charges Attract
Similar charges repel
For current to flow there must be a positive AND a negative potential
To have voltage you must have a difference in electrical pressure Positive ion Negative ion
The electromotive force between ions is called VOLTAGE
Know your Voltmeter _V_demo.swfhttp://us.fluke.com/VirtualDemos/80_series _V_demo.swf