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Lecture in Electric Currents | Physics

(Last Updated On: March 21, 2020)
Applied Physics Lecture: Electric Currents

Lesson Objectives – the students should be able to:

  • Explain how a simple battery can produce an electrical current.
  • Define current, ampere, emf, voltage, resistance, resistivity, and temperature coefficient of resistance.
  • Write the symbols used for electromotive force, electric current, resistance, resistivity, temperature coefficient of resistance and power and state the unit associated with each quantity.
  • Distinguish between a) conventional current and electron current and b) direct current and alternating current.
  • Know the symbols used to represent a source of emf, resistor, voltmeter, and ammeter and how to interpret a simple circuit diagram.
  • Given the length, cross sectional area, resistivity, and temperature coefficient of resistance, determine a wire’s resistance at room temperature and some higher or lower temperature.
  • Solve simple dc circuit problems using Ohm’s law.
  • Use the equations for electric power to determine the power and energy dissipated in a resistor and calculate the cost of this energy to the consumer.
  • Distinguish between the rms and peak values for current and voltage and apply these concepts in solving problems involving a simple ac circuit.
  • Compute Power in Household Circuits
  • Understand the Microscopic View of Electric Current
  • Learn the concept of Superconductivity
  • Could understand the Electrical Conduction in the Human Nervous System

Lecture on Electric Currents PPT

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Summary of Chapter 18

  • A battery is a source of constant potential difference.
  • Electric current is the rate of flow of electric charge.
  • Conventional current is in the direction that positive charge would flow.
  • Resistance is the ratio of voltage to current:
    Resistance Formula:
  • Ohmic materials have constant resistance, independent of voltage.
  • Resistance is determined by shape and material:
    Resistance is determined by shape and material:
  • ρ is the resistivity.
  • Power in an electric circuit:
    Power in an electric circuit:
  • Direct current is constant
  • Alternating current varies sinusoidally
    Alternating current varies sinusoidally
  • The average (rms) current and voltage:
    The average (rms) current and voltage:
  • Relation between drift speed and current:
    Relation between drift speed and current:

Units of Chapter 18 – Keywords

  • The Electric Battery
  • Electric Current
  • Ohm’s Law: Resistance and Resistors
  • Resistivity
  • Electric Power
  • Power in Household Circuits
  • Alternating Current
  • Microscopic View of Electric Current
  • Superconductivity
  • Electrical Conduction in the Human Nervous System
  • Volta
  • electrolyte

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credit: Giancoli Physics©2013 www.PinoyBIX.org

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