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Basic Electrical Theory - Electricity and
Magnetism
A.
Bhatia
Overview
Electricity and magnetism
run nearly everything we plug in or turn on. Although it’s something we take for
granted, it has taken hundreds of years of experimentation and research to reach
the point where we flick a switch and the lights go on.
Magnetism and electricity
are closely related phenomena. Electric charge is a fundamental property of
matter. Matter is made up of electrons, neutrons, and protons. Electrons have a
negative electric charge, while protons have a positive electric charge;
neutrons have no electric charge. These tiny particles are the building blocks
of atoms. An atom has a net positive electric charge when it loses one of its
electrons, and a net negative electric charge when it gains an extra electron.
On the other hand, magnetic charges do not exist - Magnetic fields are generated
solely by moving electric charges.
The three primary forces
in electricity are voltage, current flow and resistance. Voltage is the force
that pushes the current through electrical circuits. Current (which is measured
in amperes) is the rate of flow of electrical current. Resistance is the total
opposition to the flow of electricity and is measured in ohms. The scientific
definition of an ohm is the amount of resistance that will restrict 1V of
potential to a current flow of one ampere. The relationship between current,
voltage and resistance is defined by Ohm’s law, which is foundation for all
electrical installations.
This 4-hr course material
discusses the basic electrical concepts and is based entirely on US Department
of Energy training materials DOE-HDBK-1011/1-92, Fundamentals Handbook,
Electrical Science; volume 1 of 4 and covers modules 1. This course is an
excellent refresher for engineers of all disciplines who want to brush up on the
basic electrical theory that you learned in college.
The student must take a multiple-choice quiz consisting of
twenty (20) questions at the end of
this course to obtain PDH credits.
Specific Knowledge or Skill Attained
This course teaches the following specific knowledge and
skills:
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What do the terms
electrostatic force, potential difference, and electromotive force mean?
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What are the differences
between a conductor, insulator, and semiconductor?
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What is static
electricity and how it is generated?
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What is the relationship
between watts, ohms, amps and volts?
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What are six different
methods for producing a voltage (emf)?
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What is the difference
between resistance and conductance?
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What is the difference
between ideal source and real source?
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What is the significance
of the terms magnetic flux, permeability, ampere turns, field intensity, and
reluctance?
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How do ferromagnetic,
paramagnetic and diamagnetic materials relate to permeability?
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What does the shape and
components of the BH magnetization curve indicate?
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What do the terms
retentivity, reluctance, permeability and ferromagnetism mean?
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What do the Faraday's
and Lenz's law of induction imply?
Course
Click on the following PDF attachment and review the document
prior to taking
a quiz for credit.
Basic Electrical Theory - Electricity and Magnetism (1.1 MB)
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To obtain PDH credits for this course, you will need to take a quiz for
credit. Click on the link below.
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check your cookie settings.)
 
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Related Books
National Electric Code 2002 Handbook
Illustrated Guide to the NEC - Electronic
Version
Understanding NEC Calculations
National Electric Code 2002 (soft cover)
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