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ELEC130 Electrical Engineering 1 Gunilla BurrowesFernando Martinez EA G24EE 102 (p) 4921 63524921 6149 Mon &Fri 2-3pmHelp.

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Presentation on theme: "ELEC130 Electrical Engineering 1 Gunilla BurrowesFernando Martinez EA G24EE 102 (p) 4921 63524921 6149 Mon &Fri 2-3pmHelp."— Presentation transcript:


2 ELEC130 Electrical Engineering 1 Gunilla BurrowesFernando Martinez EA G24EE 102 (p) 4921 63524921 6149 email gunilla@eefmm@ecemail Mon &Fri 2-3pmHelp Desk HELP - EA G08 - during office hours

3 Material z5 modules y1 - Introductory Circuit Techniques Week 1 & 2 y2 - DC Circuit Tools Week 2 3 & 4 y3 - AC Circuit Tools Week 5 & 6 y4 - Applications in Power Week 7 & 8 y5 - Applications in Communications & Week 9 10 11 Instrumentation Week 12 & 13 zElectronic Workbench: Faculty PC’s Rm. ES210 - Go to Diomedes yLogin: cstudentnumber Password: access keys on students card + daymonth (ddmm) of birth zTopClass: yUsername: first name.last name yPassword: date of birth ddmmyy zEmail: first name.last name@studentmail

4 Lectures z2 hour / week for 13 weeks - Monday 5 -7pm zQuizzes - Weeks 3 6 8 11 13 zCourse Information Booklet zStudent Responsibility zSurvey

5 Student Responsibility zExpect CIVIL Behavior zWork consistently zProgressive assessment zTeaching / Learning zRote Learning zWhere to go for help zMaterial may not always seem relevant

6 Its Up To You zThe onus is shifted to you to “learn” (independently) zMajority of learning will take place when you tackle the subject material zBURY NOW the natural tendency to assume a passive role (waiting to be taught)

7 Text & References zCourse information Booklet & Safety Notes $12.00 Purchase after this lecture - Foyer EA zSeveral Alternative Texts yFloyd - Principles of Electric Circuits yDorf - Introduction to Electric Circuits yHambley - Electrical Engineering yJohnson - Electric Circuit Analysis zStudent Problem Sets - Library zText references zStudy Guide

8 Tutorials z1 hours / week. Start next week zCheck your group on Noticeboard Foyer EA You must Enroll Tonight zASK QUESTIONS zElectronic Workbench - ES 210 yIntroduction - Tutorial 2 Week 3 yMatrix - textbook zTutorial 1

9 Laboratory z2 hours / week - start next week zVoluntary Laboratory THIS WEEK zCheck your group on Noticeboard Foyer EA You Must Enroll Tonight - Foyer EA z EE 103(a) z9 laboratory exercises (Lab 1 goes for 2 weeks) z2 practical tests - 15 % each (Total 30%) zAll experiments are considered “examinable” zKeep a Laboratory diary

10 Laboratory zAttendance Sheets zSafety - notes will be attached to course information booklet- READ THEM zUse Common Sense zKeep the Laboratory Tidy zBE PREPARED

11 Help Desk - EE 102 / EE 103 Monday9 - 11 am Wednesday8 - 9 am 1 - 2 pm 8 - 9 pm

12 Assessment zFinal grade for ELEC 130 will be y5 quizzes @ 4% each20% y2 laboratory tests @ 15%30% yJune Exam @ 50%50%

13 Engineering zConcerned with creation of solutions to problems, based on science and technology zSystems Engineering yemphasises a wholistic design methodology y encompasses the whole life cycle of the product zRole taken on by engineering in technology-based enterprises ycreative element to convert a need into a service or product yintegration of all processes into a single coherent process

14 Multi-disciplinary & Integrating Nature

15 Engineering as a Process Technology, R & D Market research Engineering Marketing, sales and support

16 Changing Nature of Engineering zThe essence of engineering is a product of the human mind zFor the mind to be creative, it must operate on concepts (not just facts) zSwing back to the wholistic view ycomplexity of the interaction with society yrapid and fascinating development of engineering science

17 Engineering zInvolves two complementary subjects ythe body of knowledge known as engineering science ythe process of applying that knowledge

18 Aims of ELEC 130 zTo study the concepts of basic electrical elements & circuits zStart with laws of physics to derive simple ‘rules’ for electrical circuits zSame rules apply to y‘light’ current i.e. computers, communication y‘heavy’ current i.e. power grid, motors

19 Overview of DC Circuits zUnits & Notation zWhat is a circuit? zWhat is Charge / Current? zWhat is Voltage? zVoltage & Current sources zPower zResistance zOhm’s Law

20 Units zSI system - kg,m,s zOthers derived from these - Volts, Farads zScaling of Units yppico10 -12 ynnano10 -9 y  micro10 -6 ymmilli10 -3 y _ unit1 yKkilo10 3 yMmega10 6 yGgiga10 9

21 Notation zTime varying quantities - lower case e.g. v(t), i(t) ysometimes assume time - v(t) = v zTime invariant quantities - upper case e.g. V, R, zRemember to include units of measure e.g. 15 Volts

22 What is a circuit? zIn ELEC130 we assume that a circuit comprises of two or more elements connected by electrical conductors. yElectrical conductors allow electricity to flow (unimpeded) between elements zElectricity must flow in a CLOSED path or circuit

23 Open Circuit zA ‘Break’ in a circuit is called an open circuit

24 Short Circuit zA ‘bypass’ of an element is called a short circuit

25 Different Geography zTwo circuits may have the same topology but different geography

26 Charge zCharge is the phenomenon giving rise to those forces observed between electrical charged bodies. There are 2 kinds of charges: pos & neg zSymbol Q (constant) or q(t) (time varying) zDefined in terms of the charge on 1 electron ~=1.6x10 -19 Coulombs zor stated as Charge on 6.2x10 18 electrons is 1 Coulomb

27 Current zMotion of charge constitutes an electric current zConventional current is the flow of positive charges zElectron current is negative charges zMeasure of rate of flow of charge 1 Ampere = 1 Coulomb/sec zor Charge is the sum or ‘accumulation’ of current zSymbol Ii(t)

28 Current cont.. zThe primary purpose of electric circuits is to move or transfer charges along specific paths 3 A circuit - 3 A circuit =

29 Voltage zFix one Coulomb of charge in space … energy input (work) is required to bring another Coulomb of charge from a point A to a new point B closer to the fixed charge ……. the potential energy difference between points B & A is known as voltage: z1 Volt = 1 Joule / Coulomb zCharge tends to flow from a higher voltage (potential) to a lower voltage - resulting charge flow is current zSymbolVv(t)

30 Power zPower is  energy /  time zP = VI Watts zp = v(t).i(t) W zi.e. need voltage and current (at the same time) to do work zPower can be +ve and -ve; it can be ‘absorbed’ or delivered zSymbol: P p(t)Units: Watts W

31 Power Convention zIf v(t)  0 and i(t)  0 then p  0 zPower is said to be absorbed by the circuit zNB polarity of voltage and direction of current + v(t) - i(t) Circuit or element

32 Voltage & Current Source zAn ideal voltage source maintains its stated voltage regardless of the load attached xIndependent voltage source zAn ideal current source supplies its stated current regardless of the load attached xindependent current source V A V A V A I B I B

33 Ohm’s Law zSome materials are good conductors of electricity, some are poor zIn a ‘good’ conductor, the current flowing through the conductor is (approx.) proportional to the voltage across it. zConstant of proportionality is known as resistance, given symbol is R zOhm’s Law:v(t) = R i(t)

34 Example 4 V 10  i(t)

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