Physics Weekly

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Chapter 23: Electric Current
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Judith S. de Nuño
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Chapter Objectives:

  • Describe the flow of electric charge.
  • Describe what is happening inside a current-carrying wire.
  • Give examples of voltage sources that can maintain a potential difference in a circuit.
  • Describe the factors that affect the resistance of a wire.
  • Describe Ohm's law.
  • Explain the causes of electric shock.
  • Distinguish between DC and AC and describe how AC is converted to DC.
  • Compare the drift speed of conducting electrons in a current-carrying wire to the signal speed of changes in current.
  • Compare the motion of electrons in a wire carrying AC to the flow of energy through the wire.
  • Relate the electric power used by a device to current and voltage.

Chapter Terms:

  • potential difference
  • electric current
  • electrical resistance
  • superconductor
  • Ohm's law
  • direct current (dc)
  • alternating current (ac)
  • electric power
  • series circuit
  • parallel circuit

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Chapter Forumlas:

Chapter Outline Framework:

  • Flow of Charge
  • Electric current
  • Voltage Sources
  • Electrical Resistance
  • Ohm's Law
    • Ohm's Law and Electric Shock
  • Direct Current and Alternating Current
    • Converting ac to dc
  • Speed and Source of Electrons in a Circuit
  • Electric Power
  • Electric Ciruuits
    • Series Circuits
    • Parallel Circuits
    • Parallel Circuits and Overloading
    • Safety Fuses

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