Electricity & Electronic Systems SAFETY

When are Safety Glasses required? All students and visitors MUST wear safety glasses at any time there is any active lab activities This includes the classroom and the larger lab area Loaner glasses are available for visitors Students must supply their own glasses

How do I get Safety Glasses? Glasses can cost as little as $1.00 a pair Instructor can sell you glasses Tool trucks that visit school have very comfortable glasses Any auto parts store will stock a variety of glasses

Contact lenses do not belong in the shop Many solvents, chemicals, fuels and particles can be trapped next to, and damage, the eye Damage compounded by wearing contacts. Do not wear contacts in the shop environment

How do I see without contacts? Wear safety glasses over prescription glasses Obtain side shields to use with prescription glasses (available in Welding dept.) Prescription safety glasses with side shields are a good investment

Basic Electrical Theory

What can you learn from this lesson? If you understand how an electrical circuit is supposed to work And You can use a Voltmeter You can fix electrical stuff

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

What do we need to make an electrical circuit “Work” Break into groups and write a list of the basic requirements to control and use electricity Think of what has to happen to turn on a light.

What do we need to make an electrical circuit “Work” Power Source Wiring or Conductors (insulated side and ground) Control Device (switch) Load Circuit Protection (fuse)

Power Source Alternator provides power for running vehicle (Alternator provides power for running vehicle)

Load Alternator provides power for running vehicle Light bulb, motor, solenoid, etc.

Control Device Alternator provides power for running vehicle Switch, Relay, Computer

Wiring or Conductors Alternator provides power for running vehicle Insulated and Ground

Circuit Protection Alternator provides power for running vehicle Fuse or Circuit Breaker

Alternator provides power for running vehicle

Electrical “work” can be in the form of heat energy

Alternator provides power for running vehicle The light gets hot and gives off light

Electrical work can be magnetism

Magnetism pulls in the solenoid and makes the starter turn

Start on Lab #2 Power Source Wiring or Conductors (insulated side and ground) Control Device (switch) Load Circuit Protection (fuse)

Diagrams show the Power Source at the top, ground at the bottom

Diagrams show the Power Source at the Left, ground on the Right

Wiring Diagrams Wiring diagrams illustrate how a circuit is supposed to work If you know how it should work, it is easier to figure out why it doesn’t work

What can cause an electrical circuit to fail? A bad or defective: Power Source Wiring or Conductors (insulated side and ground) Control Device (switch) Load Circuit Protection (fuse or circuit breaker)