Fund Electric Circuits
Fund Electric Circuits ECE 2260
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This 10 page Class Notes was uploaded by Shyanne Lubowitz on Monday October 26, 2015. The Class Notes belongs to ECE 2260 at University of Utah taught by Staff in Fall. Since its upload, it has received 6 views. For similar materials see /class/230015/ece-2260-university-of-utah in ELECTRICAL AND COMPUTER ENGINEERING at University of Utah.
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Date Created: 10/26/15
ECE 2260 COURSE PROCEDURE 39I39J39 UN IVE RS ITY OF UTAH The learning system used in ECE 2260 has been designed on the basis of the principles of learning1 393 I won39t give you a lengthy description of those principles here but let me state informally two of them that are very important for you to understand because they should guide your work in this course 1 You learn what you practice and only what you practice 2 In order to learn you must obtain feedback about your work The first principle is extremely important to you because it tells you that you must practice to learn You actually learn very little while you are just listening to an instructor although you may be stimulated and you may get ideas and some information If you question this statement test it by listening very carefully to a lecture in which the instructor derives a relation or works out a problem Then try to do the same derivation or work the same problem without looking at your notes You will find that you have to do it yourself to learn it Your learning actually occurs as you practice that is as you answer questions solve problems design circuits explain behavior hook up circuits measure voltages measure currents test devices plot graphs take exams write reports give talks and so on This course is designed to increase your learning through practice Now let39s discuss the second principle As you attempt to learn something for example to design an RC timing circuit you must try find out if what you tried was good or bad correct your errors try again etc Finding out if what you tried was good or bad is The material in this handout is based extensively on concepts developed by Dr Carl H Durney Professor Emeritus of the University of Utah 1 C H Durney quotPrinciples of Design and Analysis of Learning Systemsquot Engineering Education March 1973 pp 406 409 2 S C Erickson quotLearning Theory and Educational Engineeringquot ERM March 1969 pp 17 18 3 C H Durney L D Harris and A W Woodruff quotSome Learning Principles and What They Meanquot Division for Improved Learning University of Utah Salt Lake City Utah called quotfeedbackquot The second principle states that you must get feedback to learn The best way to get feedback is from the real world which is what you will be doing in the lab when you construct circuits and get them to work You will also get feedback from your lab instructor as you check off your lab work with him and when he grades your reports The Study Guides are designed to give you both practice and feedback and exam solutions will be posted to give you feedback You should be sure to check exam solutions and find out what you did wrong whenever you do something incorrectly on an exam A Description of the Learning System The system consists of a Learning objectives b Classroom discussions c Study guides d Homework e One hour exam for each unit of study material see below quot2 A final exam g Four laboratory problems with formal reports Generally speaking the class work is organized into units with each unit consisting of a set of learning objectives a study guide classroom discussions and a 50 minute exam that covers one unit The laboratory problems are an integral part of the course furnishing the main practice in problem solving Both the problems and the lab work will be discussed in class Laboratom Work You will be required to keep a laboratory notebook and you must have a notebook for the first laboratory session The notebook must have duplicate pages that create a copy of what you write on each page The notebook should be approximately 8 12quot x 11quot in size and must have fastened in pages You will tear out the duplicate pages or scan or copy the notebook pages and hand them in when you complete each lab along with a separate complete lab report The notebook must be kept in ink Date and if necessary number each page The notebook should be a working record Don39t write things on pieces of paper and then go home and copy them in your notebook Make entries directly into your notebook You won t have time to write things twice If you make a mistake cross it out Don39t spend a lot of time trying to make tables and figures fancy The main purpose of the notebook is to provide a record of the work you did Write down all information that is pertinent including notes about procedures things that didn t make sense etc If your notebook is a good one you should be able to reproduce work recorded in it one year later which would obviously require carefully including details about equipment and procedures You must attend your laboratory class weekly and you must show your laboratory instructor your work demonstrate your measurements and check off with him or her each week by having them initial and date your notebook If you do not check off with your laboratory instructor each week you will be penalized and possibly receive no credit for an entire laboratory assignment Only if you receive approval in advance from your TA may you work on your laboratory project at times other than your regularly scheduled laboratory class period The Formal Report In addition to keeping records in a laboratory notebook you will write formal engineering reports on the laboratory problems These reports must be in IEEE Conference Paper format as described in handouts attached to this document and listed in the quotInstructions for writing lab reportsquot section on the course web site All rules described in these documents must be followed with the following exceptions 1 The report should be one column rather than two column and 2 Section numbering must match the numbers listed in the quotLab Report ptsquot pages as listed on the course web site This means the reports must be written in good form with complete sentences and neat well labeled diagrams etc The emphasis is on communication so the writing should 3 encourage your reader39s interest by clearly stating the purpose and objective of the report and providing the necessary information to facilitate your reader39s understanding of what you did and how you arrived at your conclusions The abstract introduction and conclusion sections of your report are very important The abstract gives a succinct summary of the report This motivates the reader by providing them with the key points they will be looking for as they read the report The introduction sets the context in which the laboratory work was performed gives background information to justify the project and sets out the organization of the entire document The conclusion lists key quantitative results major conclusions reached and insightful observations regarding why your circuit performed the way it did The conclusion may also include comments on how performance could be improved upon if as an electrical or computer engineer you were tasked to redesign the project Sloppy reports will not be accepted You should write your solutions like you would like to see a textbook example written Write your report so that one of your classmates who is unfamiliar with the problem could read your report and understand it without difficulty Be concise long reports are neither necessary nor desirable If bench space is limited you may share an equipment station You must however individually design construct and test the circuit You must also individually write your formal reports As your lab instructor checks off your lab work he or she will ask you questions to determine whether you have a good understanding of the problem solution and grade you accordingly In addition exam problems will be designed to test your ability to solve problems similar to the laboratory problems especially on the final exam If you do not thoroughly understand the laboratory problems you will find some of the exam problems very difficult Oral and Written C 39 39 Exercises You will have two communication assignments in addition to the laboratory reports an team oral presentation lasting five minutes rehearsed with the CLEAR Center Instructor and given at the beginning of a specified laboratory session and a written assignment in which you will thrice submit and twice edit the conclusion to your Lab 1 report The oral presentations will be short reviews of work done in the previous laboratory session You will deliver your presentations as a team to the students in your lab section An outline for each presentation will be handed out and posted on the course web site and talks will be assigned randomly to students shortly into the semester Students are encouraged to consult with the instructor or TA39s if they have any questions about the content of their assigned talk Students in the laboratory section will fill out and hand in short critiques of each oral presentation and these will be handed in Students will receive points for the number of critiques lled out A CLEAR Center Instructor will be available to rehearse students before their talks You will receive credit for rehearsing your talk Grading Procedures Unit exams The unit exams will be graded in the conventional way Partial credit will be given only if the work is explained clearly enough I will instruct the grader how much credit to give for each part of the problem If you make a mistake in an early step of a problem and then proceed to finish the problem with a correct procedure but incorrect work resulting from the early mistake you will be given appropriate credit for the correct procedure Solutions to the exams will be posted on the bulletin board by the Electrical and Computer Engineering office soon after the exam is given If you feel that the grader made a mistake in grading your exam write on the upper right hand cover of the exam exactly what you feel was incorrectly graded If the grader has made a mistake he or she will change your grade If you still have a question about how your exam was graded after the grader has seen it come and see me If you request that your exam be regraded you must do so before the next exam is given After the next exam is given changes in grades on previous exams will not be given Homework The homework problems will be graded only for correct answers and basic approach A homework solution displaying both a correct approach and correct answer will receive 25 points The correct approach is worth 20 points and the correct answer will receive 05 points Detailed grading will be left to the student Solutions to the homework will be posted on the course website soon after the homework is due Late homework will not be accepted Homework due dates are listed in the course syllabus Laboratog problems Laboratory instructors will grade the laboratory problems 50 of the grade will be based on the written report and 50 on the copy of your notebook you hand in at the conclusion of the laboratory exercise The grade for the written report will be based on how well the criteria in the instructions for writing lab reports are met and the point breakdown listed on the course web site The grade for the notebook will be based on how well the criteria in the rules for the laboratory notebook are met and the point breakdown listed on the course web site Oral and Written C 39 39 Exercises Grading of oral presentations is as follows Oral presentation 20 pts full points unless talk seriously inadequate Rehearsal 10 pts with CLEAR Instructor 7 pts if after lab presentation Critiques 10 pts proportional to number of talks critiqued The written assignment consists of three steps 1 Students bring a copy of the Lab 1 Conclusion to lab for peer review They also perform a peer review for a fellow student 2 After revising the Conclusion based on peer review students hand in the Conclusion for grading by the Course Instructor and CLEAR Center Instructor 3 After revising the Conclusion again based on Instructors39 reviews students hand in the Conclusion for final grading by the Course Instructor Grading of the Lab 1 Conclusion is as follows 1st submission Peer reviewed 10 pts full pts unless writing is very poor Peer review another student39s work 10 pts full pts unless writing is very poor 2nd submission Instructor reviews 20 pts full pts unless writing is very poor 3rd submission Instructor grades 20 pts Instructor assigns grade Course grades Course grades are awarded on the basis of the number of points achieved from the following list of points possible Points Possible 4 unit exams 300 3 laboratory problems 300 40 homework problems 100 2 Communication exercises 100 Final exam E Total 1000 You will take four unit exams but the one with the lowest score will be dropped Each unit exam is worth 100 points Your overall grade will be determined by the percentage of total points that you earn according to the following schedule Minimum percentage of total points required for the given grade Course grade 93 A 90 A 87 B 83 B 80 B 77 C 73 C 70 C 67 D 63 D 60 D Below 60 E Schedule The examinations will be given on dates listed in the syllabus The dates are firm Lab instructors will announce laboratory problem due dates during lab sessions Late reports are accepted only with the instructor s consent and receive reduced credit at the instructor s discretion Reports handed in up to one week late are graded at 75 of full credit All work must be turned in by time of the final exam 7 l W l By Neil E Cotter RLC CIRCUITS RLC CHAR ROOTSDAMPING Example 2 EX t0 X l iLt L 5 4m 1509 2uF 1009 After being closed for a long time the switch opens at t O a If L 125 mH nd the characteristic roots 31 and s2 for the above circuit b If L 11834 mH nd the damping frequency and c Find the value of L that makes the circuit critically damped SOL39N a Aacter i0 we have PaquLeL RLC From the oliHerenHal e551 for flue parallel RLC witA Aesfsu sfi u ed 7Car Me 501 We 73f 7519 ciqmcfe L39S id 65 797 the dircuii 52 s 1 RC LC We 7e39t fie charqcferis c39 roofs In SoilLn this Zuaalratic39 e597 0 2 1 112 a39 M 0 where 04 E mo 2 l ZRC LC Now Wt Plug in values For ComPonenEs R Kzlooxz L125mH Porparha lt22th mL LMrndS2i3 Mmts 2 OOSL39ZMF H39OO lk 25 k radS Z 39L we 2 Wts i a mtsf lZS MH 24F 250 n IR 2 7 we MGMs or w zk rads shz 25llt t25kz zkz mois 23kt LSk rads SUZ klamal lk Mal5 Nolze Red Parl 0 5 L5 always 5 0 For an RLC39 Circuit b For L H83Lr mH we have gUI Fereml 00 we mot H83qu 241 ns 2 w 225 M mois or we GER mois Noie39 Changing L aloes ho t thngtoc For a quaCCGC RLC but if woawt chem e at for a series KLC wIere ac RZL 2 z Here 51 olti xwo wdzk wogtoc 31m wD gt04 we get omplEX roots 5172 2395K39HKZSkfGISK2 Mals shZ z5kij Lo k mats We AE FLne 39Eke dqm ptnj Frezuenc y 0 be Ekt Magn ntude 0 he F armor 2 z 2 2 W0 2 We N Corvler 07 won is re versed ova lesmz 25K rad5 we k mol 5 c The circu39rt is cr HcicaLty damped when 5 52 it when l 0 or ocwo SLnde 0L 25K rads does25 dmye with L We must have N0 25k rad5 2 L L 25lt metS gt L251lts VLc LC 2520 azsfzz c25v2 L 80 mH