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### EE 302 - Lecture Slides - Unit_2[1].2___Physical_Basics_Part_2[1]

Course: EE 302, Fall 2007
School: University of Texas
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Word Count: 585

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and Energy Power 1 Energy Energy is the capacity of matter to perform work Energy is conserved. It can be neither created nor destroyed. The unit of energy is the Joule and is the same as the unit of work. 2 Power Power = energy per unit time (by definition) = Dw/Dt where w = the energy in joules t = the time in seconds The unit of power is the Watt named after James Watt (1736 1819) an English...

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and Energy Power 1 Energy Energy is the capacity of matter to perform work Energy is conserved. It can be neither created nor destroyed. The unit of energy is the Joule and is the same as the unit of work. 2 Power Power = energy per unit time (by definition) = Dw/Dt where w = the energy in joules t = the time in seconds The unit of power is the Watt named after James Watt (1736 1819) an English inventor who developed the steam engine. 3 Relationship: power, voltage and current p = w/t = (w/q)(q/t) = vi where p = power in Watts v = voltage in Volts i = current in Amperes q = charge in Coulombs Check: p (joules/second) = v (joules/coulomb) x i (coulombs/sec.) p = vi 4 Uniform electric field B Example We move 2 coulombs from A to B in 0.5 seconds and get 1 Volt A What are the current and power? Answer: 4 A and 4 W v = 1 Volt, i =q/t=2/.5 = 4 A, p=vi=(1)(4) W 5 Power and Energy Power is an instantaneous quantity Light bulbs rated in watts Motors rated in Horsepower (746 watts) Energy is a time average quantity. Electricity is sold in kilowatthours (7.82 cents per kW-hr in Austin) 6 Passive Sign Convention If P > 0, then LOAD If P < 0, then SOURCE Absorbing Power (LOAD) Supplying Power (SOURCE) 7 Total Power in a circuit is always conserved. Power delivered = Power consumed 8 Practice Problem If P1 = -100 W, P2 = 60W, P3 = -55W, P4 = 250W, calculate the power received or delivered by element 5. The following elements are loads in the circuit: A. 1, 2 B. 2, 3 C. 4, 5 D. 2, 4 9 Practice Problem To move charge q from point A to point B requires -30J. Find the voltage drop vab if (a) q=2C, (b) q=-6 C (a) Vab = w/q = -30/2 = 15 V (b) Vab = w/q -30/-6 = = 5 10 Practice Problem A stove element draws 15 A when connected to a 120 V line. How long does it take to consume 30 kJ? p = v i = 15 x 120 = 1800 watts; w = p x t therefore, t = w/p = (30x103)/1800 = 16.7 seconds 11 The Ideal Basic Circuit Element It has only two terminals It is described mathematically in terms of current and voltage It cannot be subdivided into other circuit elements 12 Active and Passive Elements Active Element: Capable of generating energy. Eg. Batteries, power supplies Passive Element: Incapable of generating energy Eg. Resistors, capacitors, and inductors. 13 Active Elements Voltage or Current Sources: Can deliver power to the circuit. Ideal Independent Source: Provides a specified voltage or current, independent of other circuit elements. Ideal Dependent Source: Source quantity is controlled by another voltage or current. 14 Independent Sources Voltage Source Current Source 15 Dependent Sources Dependent Voltage Source Dependent Current Source 16 Practice Problem Calculate the power absorbed or supplied by each component in the circuit below. Power is conserved Which of the following statements is true below? A. P1 = 5 X 8 W B. P2 = 2 X 8 W C. P3 = - 0.6 X 5 X 3 W D. P4 = - 3 X 5 W 17 Practice Problem Determine Is 18 Practice Problem A 1.2 kW toaster takes roughly 4 minutes to heat four slices of bread. Find the cost of operating the toaster once a day for 1 month (30 days). Assume energy costs 9 cents/kWh. 19 Practice Problem A battery may be rated in ampere-hours (Ah). A certain battery is rated at 160 Ah. What is the maximum current it can supply for 40 h? How many days will it last if it is discharged at 1mA? 20
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University of Texas - EE - 302
Unit 2: Basic Circuit TheoryUnit 2.3: Circuits and Circuit Elements Chapter 21Learning Objectives Review Resistance Ohm's Law Short circuit and open circuit Nodes, branches and loops Kirchhoff's Voltage Law (KVL) Kirchhoff's Current Law
University of Texas - EE - 302
Unit 2: Basic Circuit TheoryUnit 2.5: Series and Parallel CircuitsLearning Objectives Series Circuits Voltage sources Resistors Parallel Circuits Current Sources ResistorsHow do series circuits divide voltageHow do parallel circuits divide c
University of Texas - EE - 302
Unit 4: Other Circuit Analysis TechniquesUnit 4.1 Source Transformations Unit 4.2 Thevenin's Theorem/Norton's TheoremLearning Objectives Transform voltage sources with series resistors into current sources with parallel resistors source transf
University of Texas - EE - 302
Unit 3: Node and Mesh Circuit AnalysisUnit 3.1 Node Voltage Analysis Chapter 3Learning Objectives Why is there a need for more powerful techniques to solve circuits. What is the node voltage method. How do we apply it.Practice ProblemCalcul
University of Texas - EE - 302
Unit 3: Node and Mesh Circuit AnalysisUnit 3.2 - Mesh Current Analysis1Learning Objectives Review on definitions of branches, nodes, meshes and loops What are planar and non-planar circuits? What is the mesh current analysis? How do you writ
University of Texas - EE - 302
Unit 3: Node and Mesh Circuit AnalysisUnit 3.4 Superposition Chapter 4Learning Objectives What are linear circuits? What is the Superposition Principle? How can we turn off a voltage source? How can we turn off a current source? When can sup
University of Texas - EE - 302
Unit 3: Node and Mesh Circuit AnalysisUnit 3.3 - Node Voltage Analysis vs. Mesh Current AnalysisSolving Problems Since the first exam, we have introduced two systematic techniques: Node Voltage Analysis allows you to assign voltage values to eac
University of Texas - EE - 302
KVL, KVL, and Ohm's LawProblem 1a) In the circuit below, resistor R is increased. What happens to the following quantities? (Circle the appropriate answer.)R V R1 R2 R3 Power dissipated in R1 Power dissipated in R2 Power supplied by voltage
University of Texas - EE - 302
Mystery Unit: What Engineering is to me (Estimated Pages: 2-3)This unit is due on Blackboard by Monday, November 19th at 5 PM CST.In this unit, you are to write a brief essay about engineering from your own personal perspective. In your unit, you
University of Texas - EE - 302
Brian FontenotEE 302 16190 Telang Mystery Unit Essay Growing up in high school, I received many conflicting definitions of engineering. Engineering was a questionable technical field of problem solvers. Another questionable definition was engineers
University of Texas - EE - 302
Chapter 2, Problem 30. Find Req for the circuit in Fig. 2.94.66Req22Chapter 2, Problem 27. Calculate Vo in the circuit of Fig. 2.91.4+ Vo 16 V + _ 6Chapter 2, Problem 31. For the circuit in Fig. 2.95, determine i1 to i5.3i1i3
University of Texas - EE - 302
Chapter 3, Problem 1. Determine I-x in the circuit shown in Fig. 3.50 using nodal analysis.1k4kIx9V+ _2k+ _6VChapter 3, Problem 2. For the circuit in Fig. 3.51, obtain v1 and v2.Chapter 3, Problem 3. Find the currents i1 through i
University of Texas - EE - 302
Chapter 4, Problem 34. Find the Thevenin equivalent at terminals a-b of the circuit in Fig. 4.102.Figure 4.102Chapter 4, Problem 34. Find the Thevenin equivalent at terminals a-b of the circuit in Fig. 4.102.Figure 4.102Chapter 4, Problem 34.
University of Texas - EE - 302
Chapter 4, Problem 50. Obtain the Norton equivalent of the circuit in Fig. 4.116 to the left of terminals a-b. Use the result to find current iIn order to find the Thevenin's or Norton's equivalent on the left of a-b, we remove the(A) 5 and the 4A
University of Texas - EE - 302
EE 302 Lab Proficiency Exam - Example(Time for Exam: 20 minutes)Name: _ Professor: _ The goal of this exam is to measure your abilities to build a circuit on a breadboard based on a circuit schematic and accurately measure currents and voltages fro
University of Texas - EE - 302
Find the Thevenin's equivalent as seen by the 8 resistor.When finding the Thevenin's voltage, the 4 and 2 resistors are (i) In series(ii) In parallel(iii) Neither in series nor parallelWhen finding the Thevenin's resistance using the 1V test s
University of Texas - EE - 302
EE 302 Project InstructionsThe EE 302 Project is designed for you to explore UT-Austin and learn more about the engineering profession. The project will consist of a series of assignments broken up into eight units. Note that some units will require
University of Texas - EE - 302
Page 46Page 47Page 48
University of Texas - EE - 302
Explore Engineering ProjectThe EE 302 Project is designed for you to explore UT-Austin and learn more about the engineering profession. The project will consist of a series of assignments broken up into eight different units. Unit A: One page
University of Texas - EE - 302
University of Texas - EE - 302
KVL, KVL, and Ohm's LawProblem 1a) In the circuit below, resistor R is increased. What happens to the following quantities? (Circle the appropriate answer.)R V R1 R2 R3 Power dissipated in R1 Power dissipated in R2 Power supplied by voltage
University of Texas - EE - 302
Final Exam Review Part 2Dr. TelangPassive Power ConventionP = VI (current enters at positive terminal) P = -VI (current enters at negative terminal)If power is negative delivering If power is positive absorbingAlways have conservation of po
University of Texas - EE - 302
Operational AmplifiersReview with problemsOp-Amp Rules Current entering the op-amp is zero. Voltage at inverting and non-inverting inputs are equal.Practice Problem # 1 (Inverting Amplifier)Practice Problem # 2 (Inverting Amplifier)Practic
University of Texas - EE - 302
Thevenin's and Norton's Equivalents Maximum Power Transfer TheoremSummaryTo find Thevenin's or Norton's equivalent: 1. Identify the load resistor (or the resistor across which the equivalent needs to be determined), and remove it. 2. Find the open
University of Texas - EE - 302
Brian Fontenot 16190 Telang October 8, 2007 EE 302 Project Unit CEngineers have great social and ethical responsibility in our society. The success rate and performance of every engineer in the United States impacts each individual, each citizen, a
University of Texas - EE - 302
Brian Fontenot EE 302 16190 TelangMWF 9:00 AM 10:00 amSeptember 27, 20071 Brian Fontenot BLF339 16190 MWF 9:00 AM 10:00 AM Unit BEE 302 Unit B Project: Engineering in the Popular Press How Do Love Thee? (Internet Dating and the Science o
University of Texas - EE - 302
Brian Fontenot 16190 Telang October 8, 2007 EE 302 Project Unit CEngineers have a great responsibility in our society. The success rate and performance of every engineer in the United States impacts each individual, each citizen, and changes the wa
University of Texas - EE - 302
Future Trends in Power System ControlTo buy time for online computations needed for central coordination and to attain wider-area objectives for optimum operation, one has had to resort to decomposition and, therefore, multilevel hierarchical contr
University of Texas - EE - 302
Brian Fontenot EE 302 Telang 16190 10/22/07 Unit D: Current Issues in Electrical EngineeringPower transmission and the way power is controlled have been a very important issues to the field of electrical and computer engineering. The current transm
University of Texas - EE - 302
Brian Fontenot EE 302 Telang 16190 10/22/07 Unit D: Current Issues in Electrical EngineeringPower transmission and the way power is controlled have been a very important issues to the field of electrical and computer engineering. The current transm
University of Texas - EE - 302
Brian Fontenot EE 302 Telang 16190 10/22/07 Unit E: Technical Seminar- Thermal Properties of Nanostructures My eyes were open; my horizon was expanded after attending the &quot;Thermal Properties ofNanostructures: Thermoelectric Applications&quot; seminar giv
University of Texas - EE - 302
Brian Fontenot EE 302 Telang 16190 10/22/07 Unit E: Technical Seminar The tile of the seminar The name of the speaker and his/her affiliation Your brief summary of the of the seminar A summary of what you felt you learned about the topicMy eyes
University of Texas - EE - 302
Brian Fontenot BLF339 EE 302 Telang 16190 November 4, 2007 Plus/Minus Grading Your GPA is the most important definition of your scholastic ability while in college. The fact that your GPA is a determinant of your future is valid in many ways. The h
University of Texas - EE - 302
Brian Fontenot 16190 Telang EE 302 November 7, 2007 Unit G: Student Organization Meetings in Engineering UT is known for providing the best opportunities for the collegiate body. With over 900 different student organizations, the various interests of
University of Texas - EE - 302
Brian Fontenot BLF339 EE 302 Telang 16190 November 4, 2007 Plus/Minus Grading Your GPA is the most important definition of your scholastic ability while in college. The fact that your GPA is a determinant of your future is valid in many ways. The h
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Brian Fontenot 16190 Telang EE 302 November 7, 2007 Unit G UT is known for providing the best opportunities for the collegiate body. With over 900 different student organizations, the various interests of the students are heard across the campus. For
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Unit 4.3 - The Operational AmplifierChapter 51The Operational AmplifierAn active circuit element designed to perform mathematical operations of addition, subtraction, multiplication, division, differentiation, and integration.2The 741 Op Am
University of Texas - EE - 302
appendix aThe LC-3 ISAA.1 OverviewThe Instruction Set Architecture (ISA) of the LC-3 is defined as follows: Memory address space 16 bits, corresponding to 216 locations, each containing one word (16 bits). Addresses are numbered from 0 (i.e, x0000
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EE306 HW # 11. Question 3.23 on page 88 from the text. (2 points) 2. a) Draw the gate level schematic for the XOR gate. If a and b are inputs to the gate then the output c is completely described by:c= a.b' + a'.b(b' = complement of b, a'=compl
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EE 306 - Introduction to ComputingHomework #21. 2. 3. 4. 5. 6. 7. 8. 9. 3.24, from the course text 3.28 a-d 3.29 3.33 3.34 3.35 3.41 3.44 Consider the circuit shown below. The output of the MUX is A when S is 0, and B when S is 1. The signals show
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HOME WORK # 3Due Date: October 29, 2007Q1) (4.11) State the phases of the instruction cycle and briefly describe what operations occur in each phase. Q2) (4.8) Suppose a 32-bit instruction has the following format:OPCODE DR SR1 SR2 UNUSEDIf ther
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EE 306 - HW #4 Completion date: Wednesday November 7th, in class Remember 1: Make sure your name, eid, TA session are clearly marked on your submission Remember 2: FOR ALL FUTURE HOMEWORK, TEST AND EXAM SUBMISSIONS YOUR NAME, EID, AND FINAL ANSWER MU
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HW 5 Brian Fontenot BLF339 EE 306 David F: 12 1 Pm RLM 7.1161. JSR #15 2. The program checks to see if the number is the same as the mask number. If it is not, it adds itself to the orginal number and goes backs and test it to see if it's the same
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Guide to Using the Windows version of the LC-3 Simulatorand LC3Editby Kathy Buchheit The University of Texas at Austin2001, 2003Guide to Using the Windows version of the LC-3 Simulatorand LC3EditThe LC-3 is a piece of hardware, so you might b
University of Texas - EE - 306
The LC-3 SimulatorInstalling the Simulator Windows: http:/highered.mcgraw-hill.com/sites/0072467509/student_view0/lc-3_simulator.html Mac: Check Blackboard LRC Labs You can download from link above, and install in your user directory (H: Dr
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Department of Electrical and Computer EngineeringThe University of Texas at AustinEE 306, Fall 2007 Programming Assignment 1 Due: November 2nd, 11:59 pm Anthony Ambler, InstructorYou can do the programming assignment by yourself or in groups of n
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Power Aware Architectural DesignMark McDermottSep 17th, 2007Trends: Move to embedded computingPersonal Computing Embedded Computing Wintel Non-Wintel Shift of Technology Driver120Units (millions)100 80 60(%) 100 100PC5050EC04
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Department of Electrical and Computer EngineeringThe University of Texas at AustinEE 306, Fall 2007 Programming Assignment 2 Due: November 14th, 11:59 pm Anthony Ambler, InstructorYou can do the programming assignment by yourself or in groups of
University of Texas - EE - 306
Department of Electrical and Computer EngineeringThe University of Texas at AustinEE 306, Fall 2007 Programming Assignment 3 Due: 28th November, 11:59pm Tony Ambler, InstructorYou may do the programming assignment in teams of up to three people.
University of Texas - EE - 306
Introduction to Computing Fall 2007Course: EE306 Unique: 16275 - 16365 Instructor: Dr. Tony Ambler Office: ENS 236 Email: ambler@mail.utexas.edu Phone: (512) 471 6179 Office Hours: MW 1:30 3:00 Teaching Assistants: Ikhwan Lee Ardayan Pedram Vidya
University of Texas - EE - 306
Take the Path to Academic Success Four easy steps to a 4.0 in Math, Physics, &amp; ChemistryStep 1: Register for a General Engineering (GE) Course. GE courses set up a structured meeting time and place that enable you to receive additional instruction
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EE306 Homework #5 Completion date: Wednesday December 5th, in class Remember 1: Make sure your name, eid, TA session are clearly marked on your submission Remember 2: FOR ALL FUTURE HOMEWORK, TEST AND EXAM SUBMISSIONS YOUR NAME, EID, AND FINAL ANSWE
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University of Texas - M - 408c
1)(40 points) An airplane is flying at constant altitude 3 miles high and 480 miles/hour. It passes directly over an observer on the ground. How fast is the angle between them changing 30 seconds later? 3)(40) An 80 ft building throws a 60 ft shadow
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