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Electricity Powered By Docstoc
     Miss Camp
     5th grade
Berkshire Elementary
• The movement of electrons from
  one place to another.
• Made up of atoms
• When an atom loses an electron,
  it gains a positive charge. +
• When an atom gains an electron,
  it gets a negative charge. -
        Electric Charge
• When a lot of electrons jump
  from one atom to another.
• Charged objects stick to objects
  with no charge
• Discharge – movement of static
  electricity from one object to
• Opposites attract, likes repel
         Static Electricity
• Static Electricity – buildup of
  electrical charges on an object.
• Static Discharge – electrons rush
  to restore the balance of
  – Example: Lightning     – discharge of static
    electricity inside a   storm cloud to the
    ground, between 2      clouds, or between two
    oppositely charged     parts of one cloud.
          Direct Current
• Electric current that goes
  straight back to the battery
• Conductors: electricity flows
  – Copper/aluminum – conductors of
• Insulators: makes sure the
  electrons keep flowing in the
  correct direction.
      Alternating Current
• The electric current flows in one
  direction, then the other, and
  continues back and forth.
•Path by which electricity
•Open Circuit – electricity
will not flow, break in the
circuit. (Off)
•Closed Circuit –
electricity will flow. (On)
• Simple circuit –
  electricity goes from
  the battery to the
  light bulb and back
  to the battery.
        Complex Circuits
• Series Circuit – direct
  flow of electricity from
  the battery, through a
  series of light bulbs,
  then back to the
• If one bulb goes out, it
  all goes out.
        Complex Circuits
• Parallel circuit – the
  electricity flows from
  the battery, through
  two different wires,
  to the light bulbs then
  back to the battery.
• If one bulb goes out,
  the rest will stay on.
      Measuring Electricity
• Voltage – the pressure of an
  electron flow, expressed in units
  called Volts
  – Pressure = how much is flowing
• Amperage – the rate of an
  electron flow, expressed in units
  called Amps
  – Rate = how fast it is flowing
• Ability of a substance to oppose
  or slow down electric current.
• Increasing resistance of a circuit
  decreases the flow.
• Allows electrical energy to be
  changed into other forms of
  energy, such as light and heat.
          Vocabulary Review            pg. 320

1.   A buildup of electrical charge is called ______.
2.   When there is too much current in a circuit, a
     ______ will melt and break the circuit.
3.   Copper is a good _____ of electrical charges.
4.   The amount of electric current in a circuit
     depends on voltage and ____.
5.   A complete path in which electric current can
     flow is a _______.
6.   If one light bulb in a ____ burns out, none of
     the other bulbs in the circuit will shine.
7.   If one bulb in a ____ burns out, the other bulbs
     in the circuit will still shine.
8.   A flow of electrical charges through a circuit is
     called ______.
     Discussion Questions
1. How could you build a series
   circuit? How do series circuits
2. Rubbing a balloon with plastic
   wrap gives the balloon a positive
   charge. What kind of charge
   does the plastic wrap receive?
   Explain how this happens.

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