List precautions to avoid short circuits when working on an electrical system

Remove rings, watches and jewelry

Remove battery ground strap if working on or around any live circuit such as the alternator, starter, ignition switch etc.

List precautions to take before starting an engine inside the shop

Sit in operator seat to maintain control of vehicle

Insure all test leads are clear of fan, belts and exhaust

Insure no other person is working around vehicle

Insure that there is an exhaust hose attachedand ventilation fans are turned on

List precautions to take when working around a running engine

Avoid working near fan or fan belts

Do not reach over fan or moving pulleys

Properly ventilate exhaust

Insure vehicle can not roll

Pay special attention to test leads

Watch out for hot exhaust manifold

List precautions to take when working around a running engine Turn OFF engine when connecting or

moving testing leads and equipment

Only run engine during specific testing and turn off when done with test

Control any loose clothing or long hair

Basic Electrical Theory

What is Voltage?

What is an Ampere

Amperage or Electrical Current

the Intensity of the electron movement between atoms

one amp = 6,280,000,000,000,000,000 electrons per second

Carl Sagan would say that one amp equals over six billion, billion electrons per second

Amperage

The more electrons moving from atom to atom, the more current or Amperage

How many electrons (amps) move is decided by the pressure (volts) and the resistance to the flow of electrons

Low Amps

High Amps

Amperage

Higher Voltages (pressure) will cause more amps (electrons) to flow

Increasing the resistance to the electron movement will lower Amp flow

Which Way does Current Flow?

Quick Quiz

What is electricity?

The movement of electrons between atoms

What causes electrons to move between atoms?

Voltage

A bunch of extra electrons (negative ions)

An area that is missing electrons (positive ions)

Lab #4 Series Circuits