ATM 202 Automotive Electricity

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ATM 202 Automotive Electricity
Instructor Mr. Alikhan and Mr. Keith
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The Atomic Structure
Basics of Electron Flow
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What is an Atom?

• An atom is the smallest particle on any element.
• Element oxygen (O) or hydrogen (H)
• Compound two or more elements combined together
  water (H2O)
• Molecule Smallest particle of a compound

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Atom Basics
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Valence Ring

• Free Electrons

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Conductor

• Supports the flow of electrons
• Popular Conductors
• Copper, Silver, gold, iron, aluminum
• Each have three or less free electrons in its
  valence ring.

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Insulators

• Cannot support the flow of electrons
• Five of more free electrons in its valence ring
• Popular insulators
• Glass, plastic, rubber, paper, wood

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Semiconductors

• Not good conductors or insulators
• Four free electrons in valence ring.
• Silicon most popular, made from sand

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What is ELECTRICITY?
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Electricity

• Electricity is the flow of electrons through a
  conductor.
• The human body runs on electrical impulses
• The human body conducts electricity!!!

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Electrical Theories

• Electron theory electrons moving from negative
  to positive
• Conventional theory electrons flow from
  positive to negative
• Does it make a difference?

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Electromotive Force -Voltage
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Electrical Flow Current
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AC/DC Highway to Hell

• Alternating current Voltage that moves from
  positive to negative at a frequency that can vary
• Direct Current Voltage stays the same in moves
  in one direction

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Electrical Restriction Resistance
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Review

• Voltage Electrical pressure, potential,
  measured in Volts
• Current Flow of electrons past a certain point
  in a given time, measured in Amps 6.25 Billion
  Billion electrons per second 1 amp
• Resistance Opposition to current flow, load or
  work, consumes voltage, measured in ohms