ACDC

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ELECTRIC CURRENT

• Electric current is the flow of electric charge.
• Natural examples include lightning and the solar
  wind, the source of the polar aurora.
• The most familiar artificial form of electric
  current is the flow of conduction electrons in
  metal wires, such as the overhead power lines
  that deliver electrical energy across long
  distances and the smaller wires within electrical
  and electronic equipment.
• In electronics, other forms of electric current
  include the flow of electrons through resistors
  and the flow of ions inside a battery,

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OHMs LAW

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VOLTAGE

• Voltage is an electric potential difference
  between two points on a conducting wire. Voltage
  is measured in volts. Voltage comes from various
  sources. Two examples of these sources are
  batteries and electrical outlets.

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CURRENT

• Current is measured in amps. Current is charged
  particles which flow from the voltage source
  through conductive material to some form of
  resistance or a ground. Flows between opposite
  charges.

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RESISTANCE

• Resistance is the opposition that a material
  offers to the passage of an electric current.
  Resistance is measured in ohms. Examples of items
  with resistance are light bulbs, hair dryers,
  toasters.

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BATTERIES

• In very simple terms, there are two chemicals in
  a battery - one chemical wants more electrons and
  the other chemical wants to get rid of electrons.
  
• When a path (i.e. circuit) is completed between
  the two opposite ends of the battery the
  electrons are free to move from one post to
  another.
• The movement of electrons is current. Different
  chemicals and/or configurations determine how
  badly the electrons want to get from one chemical
  to another.
• That drive to get from one to another is called
  voltage potential, and is expressed in volts.
• How fast the electrons travel between the two
  chemicals is the flow, or current, and is
  expressed in Amperes or Amps...

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Conductors have low resistance.Insulators have
high resistance.

• SUPER CONDUCTORS- certain metals and compounds
  have zero resistance when their temperature falls
  to a certain temperature.
• Ex. Niobium, Tin, Mercury
• SEMICONDUCTORS- in between conductors and
  insulators. Pure state is an insulator when
  other materials are added they can often conduct
  electricity.

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Electric Circuit

• A set of electrical components connected such
  that they provide one or more complete paths for
  the movement of charges.

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Switches interrupt the flow of charges in a
circuitOpen Off Closed On
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Schematic Diagram- a graphical representation of
a circuit that uses lines to represent wires and
different symbols to represent components
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Series circuits have a single path for current.
Parallel circuits have multiple paths for current.
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FUSES CIRCUIT BREAKERS

• Fuse- an electrical device that contains a metal
  strip that melts when current in circuit becomes
  too great.
• Circuit Breaker- a switch that
• opens a circuit automatically when
• the current exceeds a certain value.

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