Presentation on theme: "Dr. Mujahed Al-Dhaifallah"— Presentation transcript:
1 Dr. Mujahed Al-Dhaifallah Term 332EE2010: Fundamentals of Electric Circuits2. IntroductionDr. Mujahed Al-DhaifallahEE2010_Lecture2Al-Dhaifallah_Term332
2 Dr. Mujahed Al-Dhaifallah د. مجاهد آل ضيف الله Office: Dean Office.Telephone:Office Hours: SMT, 1:30 – 2:30 PM, or by appointmentEE2010_Lecture2Al-Dhaifallah_Term332
3 No make up quizzes Rules and Regulations DN grade == 25% unexcused absencesHomework Assignments are due to the beginning of the lectures.Absence is not an excuse for not submitting the Homework.EE2010_Lecture2Al-Dhaifallah_Term332
4 Grading Policy Exam 1 (10%), Exam 2 (15%) Final Exam (60%), Quizzes (5%)HWs (5%)Attendance & class participation (5%), penalty for late attendanceNote: No absence, late homework submission allowed without genuine excuse.EE2010_Lecture2Al-Dhaifallah_Term332
5 AttendanceRegular lecture attendance is required. There will be part of the grade on attendanceIf you missed any class or tutorial, you are still responsible for anything you miss—announcements, quizzes, etc.
10 The Course GoalThe aim of this course is to provide an understanding of the fundamentals and analysis of electric circuits.EE2010_Lecture2Al-Dhaifallah_Term332
11 Course ObjectivesAfter successfully completing the course, the students will be able toUnderstand the fundamental concepts of electric circuits.Understand the main circuit elements including energy storage elements.Learn the different circuit analysis techniques.Obtain the equivalent circuits and find out the conditions of maximum power transfer.Apply analysis techniques to sinusoidal circuits.Evaluate the power in sinusoidal circuits.EE2010_Lecture2Al-Dhaifallah_Term332
13 Course Syllabus Introductory material: Introduction Basic circuit elements and concepts: Current, Voltage, Resistance. Chapters (2 and 3)Basic laws of circuit theory: Ohm's law, Power and Energy. Devices: Battery, Power Supply, Multi-meters, Circuit Breakers (Chapter 4)Series Circuits, Kirchhoff's Voltage law. (Chapter 5)EE2010_Lecture2Al-Dhaifallah_Term332
14 Course Outlines Parallel Circuits, Kirchhoff's Current law (Chapter 6) Series - Parallel Circuits. (Chapter 7)Techniques of circuit analysis: Source transformation, nodal and mesh analysis. (Chapter 8)Circuit theorems: superposition principle, Thevenin and Norton theorems; maximum power transfer theorem. (Chapter 9)EE2010_Lecture2Al-Dhaifallah_Term332
15 Course OutlinesCapacitors, Inductors, Series and Parallel connection. (Chapters 10 and 12)Sinusoidal Source, Complex Numbers, Frequency Domain (Phasor) Circuit. (Chapters 13 and 14).EE2010_Lecture2Al-Dhaifallah_Term332
16 Current, Voltage and Resistance EE 2010: Fundamentals of Electric CircuitsMujahed AlDhaifallah
18 Atomic Structure Mass of an Electron = 9.11 x 10-28 gm. Mass of a Proton = x gm.Proton is ~1836 times heavier than the electron
19 Atomic Structure Unit of Charge = Coulombs Charge on electron = charge on a proton = 1.6 x C1 Coulomb = Charge on x 1018 electrons
20 Coulomb’s Law Like charges repel, opposites attract F = k Q1 Q2 / r2 k = 9 x 109 (units?)
21 Coulomb’s Law Like charges repel, opposites attract F = k Q1 Q2 / r2 K = 9 x 109 N m2/C2
22 ConductionIn metals, the electrons are “more free” than the insulators.Whenever there is a charge present at one end, the electrons flow to (or away) from that charge.
23 CurrentRate of flow of charge1 Amp = 1 Coulomb / 1 Second.
24 QuestionIf a laptop constantly needs 2 Amps current from a battery, how many electrons are drained from the battery in one hour?1 Amp = x 1018 electrons/second2 Amp = x 1018 electrons/secondIn one hour - > 3600 x x 1018 electronsAnswer is 4.49 x 1022 electrons
25 Question What’s the weight of all those electrons? 4.49 x 1022 x 9.11 x gm4.09 x 10-5 gm
27 ExamplesFind the current in amperes if 650 C of charge pass through a wire in 50 s.If 465 C of charge pass through a wire in 2.5 min, find the current in amperes.If a current of 40 A exists for 1 min, how many coulombs of charge have passed through the wire?EE2010_Lecture2Al-Dhaifallah_Term332
28 ExampleConsider the plot of net positive charge moving past a point shown in Fig. Over the time interval 1 s ≤ t ≤ 3 s. Find i(t)EE2010_Lecture2Al-Dhaifallah_Term332
29 PotentialEvery particle of mass m raised to a height h above the earth’s surface has a potential energy m.g.hThis potential energy can be raised by raising the particle a little higherWhen the particle is set free, it travels to the point of least potential.
30 Electric PotentialSimilarly, a charge wants to travel to a lower “electric” potential.A negative charge on the other hand, wants to travel to a higher potential.Each point in a circuit has a potential.
31 Voltage Voltage is always measured between two points. It is defined as the difference of potential between the two points.Measured in volts
32 Volts1 volt is defined as the potential difference, which results in an energy exchange of 1 Joule due to the movement of 1 Coulomb across it.