lecture 1 ee70 fall 2007. instructor joel kubby (that would be me) office: be-249 office hours:...
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Lecture 1
EE70 Fall 2007
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Instructor
• Joel Kubby (that would be me)
• Office: BE-249
• Office Hours: M,W,F 2-3 PM or by appointment
• Phone: (831) 459-1073
• E-mail: [email protected]
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Teaching Assistant
• Drew Lohn
• Office: BE-350D
• Phone: (831) 459-3758
• E-mail: [email protected], [email protected]
• Labs: TBD (at end of class today)
• Sections: TBD
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Course Details• Course number: 15343• Course website:
http://www.soe.ucsc.edu/classes/ee070s/Fall07/ – username: ee070s– password: towan58– Lecture slides and homework will be posted on the website
• Classroom: BE-156• Time: MWF 3:30PM-4:40PM• Lab: BE150• Must enroll concurrently in course 70L• Prerequisites:
– Physics 5C/N or 6C/N– Mathematics 24 or Applied Mathematics and Statistics 27
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Pre-Requisites
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Text
• Required Text – A. R. Hambley, Electrical Engineering Principles and
Applications, Prentice Hall, Fourth Edition.
• Supplemental Texts– Schaum's Outline of Basic Circuit Analysis by John
O'Malley (plenty of solved problems!), McGraw-Hill; ISBN: 0070478244
– The Art of Electronics by Paul Horowitz, Winfield Hill, 2nd edition (1989); Cambridge Univ Press (Short); ISBN: 0521370957
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Syllabus
1. DC circuit analysis (KCL, KVL, power)
2. Linear networks (Thevenin, Norton)
3. Amplifiers (DC op amp operation)
4. Capacitors and inductors
5. Transients in circuits (1st and 2nd order, diff. equations)
6. Phasors and sinusoids
7. AC circuit analysis
8. Filter circuits
9. Transformers
10. Semiconductor devices (diode, transistors)
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Syllabus
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Grading
• Midterm 115% (10/19/07)
• Midterm 215% (11/19/07)
• Final Exam 30% (12/11/07)
• Homework 20%
• Quizzes 20%
If you are not going to be able to take the midterms and the final exam on these dates you should take this class at a later date!
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Homework
• Will be posted weekly on Friday on the course website
• Will be due the following week at the beginning of class on Friday
• No late home work will be accepted!
• Solutions will be posted after class
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Quizzes
• The quizzes will cover the topics covered in the previous lectures and the topics from the reading assignments
• The quizzes will be given at the beginning of class so please be on-time!
• We will have a pre-req evaluation next class to assess your preparation for EE70
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Evaluation Quiz
• Solution of simultaneous equations
• Determinants
• Differential equations
• Electricity and Magnetism
• Complex numbers
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Midterms and Final
• You will be provided with a sheet of key formulas that you can use on the midterms and final exam
• These sheets will be posted on the class website before the tests so that you can familiarize yourself with them
• No additional information will be allowed• Calculators with memory will be required
to be cleared prior to the exam
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How to pass this course
• Read each section of the text before class
• Work out each example as you read through the text (before class)– I will work through the examples in class
• Do the homework by yourself
• Be sure to understand any example or homework problem you got wrong– Bring questions to your TA’s section
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LabsCore lab exercises:
1. Resistive Circuits
2. Equivalent circuits and load matching
3. Transients in circuits
4. AC circuits and filter design
5. Amplifiers and op amp circuit design
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Introduction
1. Recognize interrelationships of electrical engineering with other fields of science and engineering
2. List the major subfields of electrical engineering
3. Circuits4. Current & voltage5. Waveforms, ac & dc5. Reference directions
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Electrical systems have two main objectives:
• To gather, store, process, transport, and present information
• To distribute and convert energy between various forms
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Electrical Engineering Subdivisions
• Communication systems• Computer systems• Control systems• Electromagnetics
• Electronics• Photonics• Power systems• Signal processing
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The headlight circuit in a car. (a) The actual layout of the circuit. (b) The circuit diagram
Electrical Circuits
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Fluid Analogy
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Electrical Current
Electrical current is the time rate of flow of electrical charge through a conductor or circuit element. The units are amperes (A), which are equivalent to coulombs per second (C/s).
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André Ampère (1775-1836)
http://www-groups.dcs.st-and.ac.uk/~history/PictDisplay/Ampere.html
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Electrical Current
t
t
tqdttitq
dt
tdqti
0
)()()(
)()(
0
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Circuit Elements
An electrical circuit consists of circuit elements such as voltage sources, resistances, inductances and capacitances that are connected in closed paths by conductors
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Current Variables
In analyzing circuits, we frequently start by assigning current variables such as i1, i2, i3
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Direct Current Alternating Current
When a current is constant with time, we say that we have direct current, abbreviated as dc. On the other hand, a current that varies with time, reversing direction periodically, is called alternating current, abbreviated as ac.
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.
Examples of dc and ac currents
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Examples of ac waveforms
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Reference Directions
Reference directions can be indicated by labeling the ends of the circuit elements and using double subscripts on the current variables. The reference direction for iab points from a to b. On the other hand, the reference direction for iba points from b to a. iab= - iba
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Voltages
The voltage associated with a circuit element is the energy transferred per unit of charge that flows through the element. The units of voltage are volts (V), which are equivalent to joules per coulomb (J/C).
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Alessandro Volta (1745-1827)
http://www.corrosion-doctors.org/Biographies/VoltaBio.htm
Voltaic Pile This device was made of alternating disks of zinc and copper with each pair separated by brine soaked cloth. Attaching a wire to either end produces a continuous current of low intensity.
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“downhill: resistor”“uphill: battery”
Reference Directions
Energy is transferred when charge flows through an element having a voltage across it.
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Reference Directions
The voltage vab has a reference polarity that is positive at point a and negative at point b.
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Reference Directions
The positive reference for v is at the head of the arrow
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Lab Times
Monday Tuesday Wednesday Thursday Friday8:00 AM9:00 AM
10:00 AM11:00 AM12:00 PM
1:00 PM2:00 PM3:00 PM4:00 PM5:00 PM6:00 PM7:00 PM8:00 PM