Lecture in Electric Currents

(Last Updated On: December 13, 2017)
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

Back to Homepage

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

List of Applied Physics / Physics 2 Lectures

Download Lecture

credit: Giancoli Physics©2013 www.PinoyBIX.org
Rate this:

Add Comment

© 2014 PinoyBIX Engineering. © 2018 All Rights Reserved | How to Donate?
mcq in computer fundamentals
➡️ MCQ in Computer Fundamentals Series | ECE Board Exam
mcq in industrial electronics
➡️ MCQ in Industrial Electronics Series | ECE Board Exam
MCQ in Power Generators (Cells and Batteries) Part 5 | ECE Board Exam
➡️ MCQ in Power Generators, Sources, Principles, Applications Series | ECE Board Exam
mcq in electrical circuit
➡️ MCQ in Electrical Circuit Series | ECE Board Exam

Get FREE Review Course
in your inbox

Subscribe to our mailing list and get reviewers and updates to your email inbox.

Thank you for subscribing.

Something went wrong.