ELCT 221 - ELECTRIC CIRCUITS
Instructor: Grigory SIMIN
simin@cec.sc.edu
Electric Circuits – what are they?
Who need them?
Do you need to know them?
Electric circuit is an interconnection of electric elements.
Electric circuit is also a model that describes, predicts and/or
explains the behavior of any actual electrical system.
Electric circuit is a KEY component of any field related to
Electrical Engineering
Electrical Components, Circuits and Circuits
Diagrams
Actual system:
100W Audio Amplifier
Model (electric circuit):
100W Audio Amplifier
An electric circuit is an interconnection of electrical elements.
Electrical Engineering – what is it?
Electrical engineering is the profession concerned with systems
that produce, transmit, and measure electric signals.
Over the past century and a half, electrical engineers have
played a dominant role in the development of systems that have
changed the way people live and work.
Satellite communication links, telephones, digital computers,
televisions, diagnostic and surgical medical equipment,
assembly-line robots, and electrical power tools define a
modern technological society.
Electrical systems pervade our lives; they are found in homes,
schools, workplaces, and transportation vehicles - everywhere.
National Academy of Engineering:
GRAND CHALLENGES FOR ENGINEERING
• A diverse committee of experts from around the world
• The most accomplished engineers and scientists of their
generation
• Proposed 14 GRAND challenges
• Committee Chair, WILLIAM PERRY, Former
Secretary of Defense, U.S. Department of Defense
Professor of Engineering, Stanford University
National Academy of Engineering:
GRAND CHALLENGES FOR ENGINEERING
Electrical systems and components
Communication systems:
televisions, cameras,
transmitters, receivers, and
VCRs; radio telescopes, used to
explore the universe; network
and satellite systems, radar
systems, telephone systems...
Communications: 100 years ago
Telegraph operator printing telegram, 1908, courtesy
Library of Congress
On January 27, 2006, Western Union sent its final telegram.
Communications: 100 years ago
Communications today:
Mobile Satellite Services
Terrestar Satellite Phone has
satellite, quad-band GSM, triband WCDMA/HSPA
connectivity along with
Bluetooth and WiFi.
Convergence of Terrestrial and Satellite mobile
communication systems
Communication system: GPS
The GPS system combined with
computer electronics and
software also forms a Signal
Processing System
Control systems: use electric
signals to regulate processes.
Examples: Temperature, pressure,
flow rates regulators; fuel-air
mixture control in a fuel-injected
automobile engine.
Motors, doors, elevators controls.
Locks in the Panama Canal.
The autopilot and autolanding
systems.
Control system example: dark activated switch
Actual system
Model (electric circuit)
Signal-processing systems:
transform the signals and the information contained
in them into a suitable form.
Computerized tomography
takes signals generated by an Xray machine and transforms
them into an image.
Original X-ray signals are of
little use to a physician;
once they are processed into a
recognizable image the
information they contain can be
used in the diagnosis of disease
or injury.
Modern electronic systems are highly sophisticated; they combine
control, signal processing, communication, power and computer
systems
A sophisticated communications system enables the
pilot and the air traffic controller to monitor the
plane’s location.
Onboard computer system manages engine functions,
implements the navigation and flight control systems,
and generates video information on screens in the
cockpit.
A complex control system uses cockpit commands to
adjust the position and speed of the airplane.
Power system provide and distribute the electric
power needed for computers, to control the engines,
keep the cabin lights on, A/C, show the movie etc.
Signal-processing systems reduce the noise in air
traffic communications and transform information
about the plane’s location into the image on display.
signal-processing
systems
power systems
control systems
computer systems
communication systems
The five major classifications of electrical systems:
ELCT 221 textbook
1) Fundamentals of Electric
Circuits, by Charles
Alexander, Matthew
Sadiku, 4th edition, ISBN
0077263197 /
9780077263195, McGraw
Hill
2) PSpice for Basic Circuit
Analysis with CD, by
Joseph G. Tront, ISBN
0073263192 /
9780073263199, McGraw
Hill.
Supplemental readings (recommended, optional):
Lessons In Electric Circuits
A free series of textbooks by Tony R. Kuphaldt
http://ibiblio.org/obp/electricCircuits/
Schaum's Outline of Basic Electricity“ by Milton Gussow, ISBN:
0070252408, McGraw-Hill
"Getting to Know Semiconductors" by M.E Levinshtein and G. S. Simin,
World Sci. Publ. Co., Singapore, London, NY, 1992; ISBN: 9810207603
MATLAB Programming for Engineers
by Stephen Chapman (3rd edition) August 2004, ISBN: 0534424171
Publisher: Thomson
ELCT 221 contents
Part I – DC circuits
Chapter 1: Basic concepts
Systems of Units, Charge and Current, Voltage, Power and Energy, Circuit
Elements
Chapter 2: Basic Laws
Ohm's Law, Nodes, Branches, and Loops, Kirchhoff's Laws, Series Resistors and Voltage
Division, Parallel Resistors and Current Division
Chapter 3: Methods of Analysis
Nodal Analysis, Mesh Analysis, Nodal and Mesh Analyses by Inspection, Nodal Versus
Mesh Analysis, Circuit Analysis with PSpice,Applications examples
Chapter 4: Circuit Theorems
Linearity, Superposition, Source Transformation, Thevenin's and Norton's Theorem
ELCT 221 contents
Part II – AC circuits
Chapter 6: Capacitors and Inductors
Capacitors, Series and Parallel Capacitors, Inductors, Series and Parallel Inductors
Chapter 7: RC and RL Circuits
Step Response of an RC and RL Circuits, Transient Analysis with PSpice
Chapter 9: Sinusoids and Phasors
Sinusoids, Phasors, Impedance and Admittance, Kirchhoff's Laws in the Frequency Domain
Chapter 10: Sinusoidal Steady-State Analysis
AC Nodal and Mesh Analysis, Superposition, Thevenin and Norton Equivalent Circuits,
AC Analysis Using PSpice
Chapter 11: AC Power
Instantaneous and Average Power, Maximum Average Power Transfer, Effective or RMS
Value, Power Factor
Chapter 12: Three-Phase Circuits
Balanced Three-Phase Voltages, Balanced Wye-Wye, Wye-Delta, Delta-Delta and DeltaWye Connections, Power in a Balanced System
Computer tools and simulators
In ELCT 221
(Room 1D15)
MATLAB
PSPICE
Class WEB Page:
http://www.ee.sc.edu/classes/Spring10/ELCT221/
http://www.ee.sc.edu/classes/Spring10/ELCT221/
The most important
link for you
Homework assignments will be given mostly using LON-CAPA
http:// lon-capa.engr.sc.edu
http://loncapa2.ee.sc.edu/adm/roles
Login name: same as your EE account
name
Initial password:
LC+xxxx
where “+” is the “plus sign” and xxxx are
the last 4 digits of your SSN.
After the first logon you can change the
password. A good practice would be to
match your ENGINEERING password.