1 / 24

ELECTRIC CIRCUITS ECSE-2010 Spring 2003 Class 12

ELECTRIC CIRCUITS ECSE-2010 Spring 2003 Class 12. ASSIGNMENTS DUE. Today (Monday): Exam I, 7-9 pm, DCC 308 Homework #4 Due Experiment #3 Report Due Activities 12-1, 12-2 (In Class) Tuesday/Wednesday: Will do Experiment #5 in Class (EP-5) Activity 13-1 (In Class) Thursday:

sileas
Download Presentation

ELECTRIC CIRCUITS ECSE-2010 Spring 2003 Class 12

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ELECTRIC CIRCUITSECSE-2010Spring 2003Class 12

  2. ASSIGNMENTS DUE • Today (Monday): • Exam I, 7-9 pm, DCC 308 • Homework #4 Due • Experiment #3 Report Due • Activities 12-1, 12-2 (In Class) • Tuesday/Wednesday: • Will do Experiment #5 in Class (EP-5) • Activity 13-1 (In Class) • Thursday: • Experiment #4 Report Due • Will do Experiment #6 in Class (EP-6) • Activity 14-1 (In Class)

  3. REVIEW • Operational Amplifiers: • High Gain, Differential Voltage Amplifiers: • Real Op Amp Has: • “High” Input Resistance (~10 Mohms) • “Low” Output Resistance (~100 ohms) • “High” Voltage Gain (105-106) • Will Usually Model with Ideal Op Amps: • Ideal Op Amp Has: • Infinite Input Resistance • Zero Output Resistance • Infinite Gain

  4. REVIEW • Operational Amplifiers: • If Add Negative Feedback => Virtual Short at Input • vp= vn; ip = in = 0 • Leads to Useful Circuits • Use Virtual Short and Circuit Analysis to find Output • Effects of Real Op Amps => Use PSpice • Ideal Op Amp is a Very Good Model for a Real Op Amp (Saw this in Computer Project #1)

  5. CIRCUITS WITH R, L, & C • For Resistive Circuits: (No L or C) • v = i R; => v(t) = i(t) R • Resistor does not affect time behavior • Resistors only absorb energy (get hot) • Resistors convert electrical energy to thermal energy

  6. CIRCUITS WITH R, L, & C • R, L, C Circuits: • L = Inductor; C = Capacitor • v, i are now time dependent • v(t) and i(t) may be quite different waveforms • L and C can store electrical energy! • Makes circuits far more interesting • Must find Time Behavior of circuit

  7. ACTIVITY 12-1

  8. ACTIVITY 12-1

  9. ACTIVITY 12-1

  10. CAPACITANCE

  11. CAPACITANCE • See Symbol: • Relationship Between i and v: • ic= C dvc/dt • Measure C in Farads: • 1 farad = 1 amp-sec/volt

  12. CAPACITANCE • DC Steady State: • d /dt = 0 • => iC = CdvC/dt = 0 in DC Steady State • Capacitor is an Open Circuit in DC Steady State • If apply a DC source, Capacitor will charge up to some voltage and stay there in the Steady State

  13. CAPACITANCE

  14. CAPACITANCE • Capacitors in Series: • 1 / Ceq = 1 / C1 + 1 / C2 + 1 / C3 + .. • Similar to Resistors in Parallel • Capacitors in Parallel: • Ceq = C1 + C2 + C3 + … • Similar to Resistors in Series

  15. CAPACITANCE • Energy Stored in Capacitor: • wc = (1/2 ) C vC2 • Energy stored in Electric Field • Voltage Across Capacitor Cannot Change Instantaneously: • Capacitor voltage must be continuous in time • No instantaneous jumps

  16. INDUCTANCE

  17. INDUCTANCE • See Symbol: • Relationship Between i and v: • vL = L diL/dt • Measure L in Henries: • 1 henry = 1 volt-sec/amp

  18. INDUCTANCE • DC Steady State: • d /dt = 0 • => vL= LdiL/dt = 0 in DC Steady State • Inductor is a Short Circuit in DC Steady State • If apply a DC Source, Inductor will have current flowing in it, but no voltage across it in the Steady State

  19. INDUCTANCE

  20. INDUCTANCE • Inductors in Series: • Leq = L1 + L2 + L3 + … • Similar to Resistors in Series • Inductors in Parallel: • 1 / Leq = 1 / L1 + 1 / L2 + 1 / L3 + .. • Similar to Resistors in Parallel

  21. INDUCTANCE • Energy Stored in Inductor: • wL = (1/2 ) L iL2 • Energy Stored in Magnetic Field • Current Through Inductor Cannot Change Instantaneously: • Inductor Current must be continuous in time • No instantaneous jumps

  22. ACTIVITY 12-2

  23. ACTIVITY 12-2 • v = vL = L diL/dt: • iC = C dvC/dt = C dvL/dt • is = iC + iL ; If is = 0; iC = - iL

  24. ACTIVITY 12-2

More Related