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Transcript of CHAPTER 1 CHAPTER 1 NETWORKS 1: 0909201-02/03 NETWORKS 1: 0909201-02/03 23 OCTOBER 2002 ROWAN...
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CHAPTER 1CHAPTER 1
NETWORKS 1: NETWORKS 1: 0909201-02/030909201-02/03 23 OCTOBER 2002
ROWAN UNIVERSITYROWAN UNIVERSITY
College of EngineeringCollege of Engineering
Professor Peter Mark Jansson, PP PEProfessor Peter Mark Jansson, PP PEDEPARTMENT OF ELECTRICAL & COMPUTER ENGINEERINGDEPARTMENT OF ELECTRICAL & COMPUTER ENGINEERING
Autumn Semester 2002 – Quarter TwoAutumn Semester 2002 – Quarter Two
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Welcome to Networks I
Learning Objectives – Define circuit elements Analyze electrical circuits Apply circuit parameters (v, i, r, p, etc.) Analyze DC circuits with passive elements
including: resistance, energy storage (C,L) Build/Model circuits using Mentorgraphics,
Pspice, IMITS and MatLab
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Learning Aids: Overview
Lectures – Rowan Auditorium
Laboratories – Rowan Hall Room 204/6
Two Lab Sections – M12.30-3.15, M3.30-6.15
Syllabus / Text (read ahead – ch. 1/2) Computer Tools Website Email
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Learning Aids:
Required Text : Introduction to Electric Circuits 5th Edition Dorf and Svoboda
Website : http:www.engineering.rowan.edu/~jansson/
Check your Email regularly (daily)
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Cruise course website
Website : http:www.engineering.rowan.edu/~jansson/
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Learning Evaluation
Grades Tests (3 @ 20%), Assignments (40%) LECTURE:
In-Class, HW and Participation (20%) LABS:
Reports, HW, etc. (20%)
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Section 1 – PC/Laptop Reqm’ts
Windows 9x, NT, 2000, Me or XP Pentium 233 MHz or faster 16 Mb RAM 255 Mb free disk space (required) 12X CD-ROM drive or better 16-bit Sound card or better 2 Mb Video card or better
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chapter 1 – overview
history of electricity electric circuits and current flow systems of units voltage power and energy voltmeters and ammeters circuit analysis and design
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Imagine a World with..
No internetNo cell phonesNo computersNo television or video gamesNo mass communication (radio, telephone)No tall buildings
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Imagine a World with..
No electricityNo electronic devicesNo medical technologyNo appliances Refrigerators Microwaves Water heaters Air conditioning
No traffic controls
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That world would be
PrimitiveDifficult to survive in A very hard life……
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Electrical Engineers Transformed Society
Long, long ago in countries far, far away the journey began…..2367 BC – Hoang-Ti in China1110 BC – Tchi-nan designed600 BC – Etruscans control lightning250 BC – Flying Cupid in Diana’s temple658 AD – Japan’s first magnetic cars
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Electrical Science Emerges
600 AD Attractive power of E-S materials1551Electricity and Magnetism defined1672Pointed Conductors 1720Grey’s Planetarium1746 Atmospheric Electricity discovered1814Electrical Spectrum detailed1821First Electric Motor
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Electric Technology
1825 First Electromagnet1832 First E-M Induction Generator1837 Telegraph1879 First DC Power System1888 First AC Generator1895 X-rays Discovered1901 Radio
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Quotable Quotes
Everything that can be invented has been invented Charles H. Duell - US Patent Office 1899
Heavier than air flying machines are impossible Lord Kelvin – Royal Society 1895
There is no likelihood man can ever tapthe power of the atom Robert Milliken Nobel Laureate Physics 1923
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Discovery continues
AC Electric Grids 1900sFlourescent Lighting 1930sComputing – 1930sTelevision – 1940sPersonal Computing 1970sInternet – 199021st Century ?
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electric circuits & current flow
An electric circuit is an interconnection of circuit elements linked together to form a closed path so that electric current may flow continuously
Battery Resistor
i1
Where is ground?
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electric circuits & current flow
Current is the time rate of flow of electric charge (q) past a given pointUse lower case to indicate a time varying current and upper case to indicate a constant or direct current
i1 i2dt
dqi 21 ii
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units
Systeme International d’UnitesBase Units (m, kg, s, A, K, mol, cd)Derived Units (J, W, C, V, Ω, S, F, Wb, H)
See text page 13 What are base units for Energy (J) and
Power (W)
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voltageThe voltage across an element is the work (energy) required to move a unit positive charge from the - terminal to the + terminal.
a b
ba
+ vab -
- vba + baab vv dq
dwv
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powerPower is the time rate of expending energy.Power absorbed by an element is positive, Power delivered by an element is negative.
a b
ba
+ vab -
- vba +
i
i
ivdt
dq
dq
dw
dt
dwp
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passive sign convention (psc)
Positive current flows from positive voltage to negative voltage.
a b
- vab +i
ba
+ vab -
i
Is the current in
this resistor positive
or negative?
Is the current in
this element positive
or negative?
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power and psc
p = v • i Power is absorbed by an element adhering to
the passive sign convention (sink)
Power is supplied by an element not adhering to the passive sign convention (source)
a b
+ vab -i
a b
- vab +i
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power and energy
p = v • i power = voltage * current
energy = power * time
tpdt w0
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electric circuits & current flow
Current is the time rate of flow of electric charge (q) past a given pointUse lower case to indicate a time varying current and upper case to indicate a constant or direct current
i1 i2dt
dqi 21 ii
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voltageThe voltage across an element is the work (energy) required to move a unit positive charge from the - terminal to the + terminal.
a b
ba
+ vab -
- vba + baab vv dq
dwv
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voltage / current analogy
mechanical system analogy: pump, fluid pressure (head), velocity battery, voltage, current
high pressure (head) high voltage increased fluid flow high current increasing either: increases power
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circuit analogy envision a closed system of water flowing in troughs pumps elevate the head of the flow and increase its velocity in various troughs flow of mass is conserved energy can be added (pumps) or extracted (waterwheels) though overall system of water flow is conserved energy is transferred by head and velocity in a given part of circuit flowrate is constant
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powerPower is the rate of expending energy.Power absorbed by an element is positive, Power delivered by an element is negative.
a b
ba
+ vab -
- vba +
i
i
ivdt
dq
dq
dw
dt
dwp
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passive sign convention (psc)
positive current flows from positive voltage to negative voltage.
a b
- vab +i
ba
+ vab -
i
Is the current in
this resistor positive
or negative?
Is the current in
this element positive
or negative?
![Page 31: CHAPTER 1 CHAPTER 1 NETWORKS 1: 0909201-02/03 NETWORKS 1: 0909201-02/03 23 OCTOBER 2002 ROWAN UNIVERSITY College of Engineering Professor Peter Mark Jansson,](https://reader035.fdocuments.net/reader035/viewer/2022062517/56649f395503460f94c56c70/html5/thumbnails/31.jpg)
power and psc
p = v • i Power is absorbed by an element adhering to
the passive sign convention (sink)
Power is supplied by an element not adhering to the passive sign convention (source)
a b
+ vab -i
a b
- vab +i
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power and psc example what is the power absorbed or supplied by the element below, when i = 4A?
power = 12V x 4A = 48 W does not adhere to passive sign convention,
so power is supplied.
a b
- vab = 12V +i
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power and psc quiz what is the power absorbed or supplied by the element below, when i = 4A?
power = 12V x 4A = 48 Wdoes not adhere to passive sign convention,
so power is supplied.
a b
- vab = 12V +i
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power and energy
p = v • i power = voltage * current power is the time rate of expending
energy
energy = power * time energy is the capacity to do work
tpdt w0
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power and energy
energy = force x distance
power = energy / time period (secs)
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power and energy example
a mass of 300 grams experiences a force of 200 newtons. Find the energy (or work expended) if the mass moves 15 cm. Also find the power if the move is completed in 10 milliseconds. energy = force x distance (N • m) energy = 200 x .15 = 30J power = energy / second (J/sec=Watts) power = 30J/10-2 sec = 3000W = 3kW
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power and energy quiz
a Motorola StarTAC cellular phone uses a small 3.6V lithium ion battery with nominal stored energy of 200 joules. For how long will it power the phone if it draws a 3-mA current when in operation?
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quiz solution
200 joules = 200 watt-secs 3.6 V x 3 mA = 1.08 x 10-2 watts 200 watt-secs / 1.08 x 10-2 watts =
18,519 seconds
18,519 seconds / 3600 sec/hr = 5.1 hours
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voltmeters and ammeters dc current and voltage measurements are made with (analog or digital type) ammeters and voltmeters voltage measurements are made with red probe (+) at point a, and black probe (-) at point b
a b
+ vab -i
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voltmeters and ammeters current measurements require breaking into the circuit so the ammeter is in series with the current flow made with red probe (+) at point b, and black probe (-) at point c
a bc
+ vab -i
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ideal meters
ammeters – negligible voltage drop through it
voltmeters – negligible current flows into it
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circuit analysis and design
analysis – concerned with the methodological study of a circuit to determine direction and magnitude of one or more circuit variables (V, A) problem statement situation and assumptions goal and requirements plan act verify if correct, solved if not, plan act verify iterate as
needed
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WHAT DO YOU KNOW (or, what’s going to be on the test)?
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Homework for next week
See website show all work for any credit Dorf & Svoboda, pp. 24-27
Problems 1.3-1, 1.3-2, 1.3-6, 1.3-7, 1.6-3, 1.6-5,
1.6-10, 1.6-12, 1.6-14, 1.6-19 Verification Problem 1-1 Design Problem 1-2