Lecture 1: Introduction

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Lecture 1 Introduction
Instructor Dr. Gleb V.
Tcheslavski Contact gleb_at_lamar.edu Office
Hours Cherry 2030 Class web site
www.ee.lamar.edu/gleb/em/Index.htm
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Pre-requirements
Classes

• MATH 3328 Linear Algebra
• MATH 3301 Ordinary Differential Equations
• ELEN 2311 Circuits I
• PHYS 2426 Calculus Based Physics II.

Topics

• DC and AC Circuits
• Calculus-Based Physics in Electricity and
  Magnetism
• Analytic Geometry and Calculus II including
  Vector Analysis
• Calculus III including Partial Derivatives,
  Double and Triple Integrals, Vector Fields,
  Stoke's Theorem, and Vector Calculus
• Differential Equations
• Linear Algebra.

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Textbooks
Elements of Electromagnetics, Fifth Edition,
Matthew N.O. Sadiku, Oxford University Press,
Inc., 2010, ISBN 978-0-19-538775-9.
Required
Karl E. Lonngren and Sava V. Savov, Fundamentals
of Electromagnetics with MATLAB, SciTech
Publishing, Inc., 2005, ISBN 1-891121-38-3.
Recommended
Robert E. Collin, Antennas and Radio-wave
Propagation, Mcgraw-Hill College, 4th edition,
ISBN 0-0701-1808-6.
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Class structure and your grades
Five to ten homeworks, two exams, and the final
exam. Exams are closed books/notes. Homeworks and
exams are covered by the Academic Honor Code
Attendance Policy Exams attendance is mandatory
with exemptions of individual or family
emergencies, health conditions etc. Valid
documentation will be required. You are required
to attend all lectures! Your attendance may
affect your final grade.
NO late homework will be accepted!
Tentative grading weights
Homework Exam 1 Exam 2 Final exam
20 20 25 35
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Styles, notations, legends
3. xx next to the formula indicates units.
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Whats this course about?

• We will study electric and magnetic fields.
• We review STATICS (zero or low frequency).
• and study DYNAMICS including Maxwells and
  Helmholtz equations, wave propagations, antennas,
  etc.

• The basic sources of electromagnetic (electrical)
  forces are stationary and moving electric
  charges, which exert forces on other stationary
  and moving electric charges. To study these
  forces, the concept of force fields has been
  devised.
• When charges are stationary, the force field is
  an electric (electrostatic) field.
• When charges are moving with a constant velocity,
  the force field is a magnetic (magnetostatic)
  field.
• Accelerating charges produce electromagnetic
  fields.

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Statics
Definition f 0 Hz
The electromagnetic field splits into two
independent parts
Electrostatics (q, E)
Static charge
Magnetostatics (I, B)
Constant current
The static approximation is valid when the
dimensionof the circuit is small compared to the
electrical wavelength.
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Concepts of frequency/wavelength
Example a circuit working at 60 Hz.
?0 c / f - wavelength in vacuum
c 2.99792458 ? 108 m/s
f 60 Hz
This gives ?0 4.9965?106 m
4,996.5 km
Most circuits fall into the static-approximation
category at 60 Hz.
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Some history
Charge was discovered by the Ancient Greeks
(about 600BC) who found that rubbing fur on
various substances, such as amber, would build up
an electric charge imbalance.
The Greeks noted that the charged amber buttons
could attract light objects such as hair.
The Greeks also noted that if they rubbed the
amber for long enough, they could even get a
spark to jump.
The word electricity derives from ??e?t???, the
Greek word for amber.
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Some history (cont)
Two glass rods rubbed with silk and placed near
one another were observed to repel each other.
On the other hand, if a resin (plastic) rod
rubbed with fur is placed near one of the glass
rods, the force was attractive.
Benjamin Franklin (mid 1700s) is credited with
naming electrical charge that appearing on the
glass rod was designated positive and that on the
resin (plastic) rod, negative.
Franklin was well known for his many quotations
and his experiments with electricity
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Folks contributed to the research on electricity

• Luigi Galvani (17371798),
• Alessandro Volta (1745-1827),
• Michael Faraday (17911867),
• André-Marie Ampère (17751836),
• Georg Simon Ohm (1789-1854).
• Nikola Tesla,
• Thomas Edison,
• George Westinghouse,
• Werner von Siemens,
• Alexander Graham Bell
• William Thomson (lord Kelvin)

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