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

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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.

2
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

3
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

4
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

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Basic Electrical Theory
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What is Voltage?
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What is an Ampere
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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

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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

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Low Amps
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High Amps
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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?

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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)

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Lab 4 Series Circuits