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Electric Circuits: Assignments, Projects, and Exam Review for Spring 2010

This document outlines key assignments and projects for the Electric Circuits course (Spring 2010). It includes details on the in-class computer project (CP-5), report due dates for experiments, and final exam information scheduled for May 7. Students are reminded to review resonance in circuits, especially the effects of resistors on resonance frequencies. Additionally, guidance for conducting AC circuit simulations using PSpice is provided, covering frequency sweeps and circuit configurations.

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Electric Circuits: Assignments, Projects, and Exam Review for Spring 2010

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  1. ELECTRIC CIRCUITSECSE-2010Spring 2003Class 38

  2. ASSIGNMENTS DUE • Today (Tuesday/Wednesday): • Will do Computer Project #5 in Class (CP-5) • Activities 38-1, 38-2 (In Class) • Thursday: • Experiment #9 Report Due • Activities 39-1, 39-2 (In Class) • Next Monday: • Homework #14 Due • Experiment #10 Report Due • Computer Project #5 Report Due • Activity 40-1, Experiment 11 (In Class)

  3. FINAL EXAM • Wednesday, May 7 • 8 - 11 am • Sage 3303 for All Sections • 2-8 1/2 x 11 inch Crib Sheets • Laplace Tables Will Be Included with the Final Exam • Students with Conflict should Notify Prof. Jennings (jenniw@rpi.edu)

  4. REVIEW V I

  5. REVIEW

  6. NOTES ON RESONANCE • In “real” circuits, often do not have a “pure” Series or pure Parallel situation: • Inductors always have Rw • Elements may not all be in series or parallel • Will still have Resonance, but at a slightly different Resonant Frequency • May have Multiple Resonances in same Circuit • Define Resonance as when X (series-like circuit) or B (parallel-like circuit) => 0 • Let’s do a problem => Activity 38-1

  7. ACTIVITY 38-1

  8. ACTIVITY 38-1a

  9. ACTIVITY 38-1a

  10. ACTIVITY 38-1a

  11. ACTIVITY 38-1a

  12. ACTIVITY 38-1b

  13. ACTIVITY 38-1b

  14. ACTIVITY 38-1b

  15. ACTIVITY 38-1c

  16. AC PSPICE • Now want to simulate AC Circuits using PSpice: • AC Sources • C’s and L’s • Usually want to look at behavior as a function of Frequency: • AC Sweep (Schematics) • .ac Statement (Circuit file)

  17. AC PSPICE-CIRCUIT FILE • AC Voltage Source: V 1 0 AC 10 • AC Current Source: I 0 1 AC 3 • Do Not have to designate frequency when specifying source: • Do later with .ac statement

  18. AC PSPICE-SCHEMATICS • AC Voltage Source: • Use VAC • Doubleclick on VAC • Designate Amplitude and Phase • AC Current Source with Schematics: • Use IAC; Designate same as VAC • Do Not have to designate frequency when specifying source: • Do later with AC Sweep in Analysis

  19. AC PSPICE • Capacitors/Inductors: C 1 0 2u L 1 0 .1m • Start “name” with C or L • Connected between nodes 1 and 0 (+, -) • C = 2 uF; L = .1mH • Do Not need Initial Conditions for AC Steady State • Use IC’s when doing Transient Analysis • Doubleclick C and L in Schematics to set Values and IC’s

  20. AC PSPICE • .acStatement: .ac lin 400 10 16k • Perform AC Sweep (Sweep AC frequencies) • Perform a linear sweep (will do decade sweeps later) • Divide frequency range into 400 points • starting frequency = 10 Hz (note: f) • ending frequency = 16 kHZ

  21. AC PSPICE • In Schematics: • Doubleclick Set Up Analysis • Choose AC Sweep and Doubleclick • Choose Type of Sweep • Choose Start and End Frequencies • Choose Number of Points • Remember PSpice uses Frequencies in Hz

  22. ACTIVITY 38-2

  23. ACTIVITY 38-2 • Similar to Activity 38-1: • Not a “Pure” Parallel Resonant Circuit • Inductor has Winding Resistance • Want to see how this affects Resonance • Let Rw = 10-9 ~ 0, 2 ohms • When Rw = 0, fo ~ 8 kHz, Qparallel ~ 10 • See what happens when Rw = 2 ohms • Let’s Practice using Schematics

  24. ACTIVITY 38-2

  25. ACTIVITY 38-2 • Need to Set X Axis to Linear: • Probe automatically uses a Log scale • Go to Plot, X Axis Settings, Linear • To Look at Amplitude/Magnitude: • Plot Vm(1)@1 or Im(C)@1 • Amplitude/Magnitude of the Voltage at Node 1 for Case 1 (Rw = 10-9 ohms) • To Look at Angle/Phase: • Plot Vp(1)@2 or Ip(C)@1 • Angle/Phase of the Voltage at Node 1 for Case 2 (Rw = 2 ohms)

  26. ACTIVITY 38-2 • With RW = 10-9 Ohms: • f0=7.985 kHz • iC,max = 10 Amps • Qparallel = 10 • With RW = 2 Ohms: • f0 = 8.225 kHZ • iC,max = 3.47 Amps • Qparallel = 3.47 • Change f0 a little • Reduce Qparallel a lot:

  27. COMPUTER PROJECT 5

  28. COMPUTER PROJECT 5 • Circuit is both “Series-like” and “Parallel-like”: • Will have both Series and Parallel Resonances • Resonances occur at different frequencies • Identify by Minimum or Maximum of /Z/ • /Z/ is a Minimum at Series Resonance • /Z/ is a Maximum at Parallel Resonance

  29. COMPUTER PROJECT 5 • PSpice wants frequencies in Hertz: • Project asks to sweep • Must convert = 2 f • Plot as function of = f * 6.28 • Use Linear X Axis • Note: Zin = Vin / Iin • Vin = Volts • => Yin = Iin /1 Siemons

  30. COMPUTER PROJECT 5

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