What is Thevenin: Definition and 318 Discussions

Thévenin is a surname. Notable people with the surname include:

Charles Thévenin (1764–1838), neoclassical French painter
Denis Thévenin, birth name of French author Georges Duhamel
Léon Charles Thévenin (1857–1926), French engineer
Nicolas Thévenin (born 1958), bishop and Vatican diplomat
Olivier Thévenin (born 1968), French racing driver

View More On Wikipedia.org
Recent contents Top users
  1. M

    Find the resistance for maximum power transfer

    Homework Statement Find the value of R where RL equals 50 Ω, for maximum power transfer I= 2A, R_L=50 ohms Homework Equations R_th=V_oc/I_sc KCL,KVL,V=IR The Attempt at a Solution First, I created an open circuit including everything except R_L. Then i tried to solve for the Open Circuit...
  2. P

    Thevenin's equivalent of wheatstone bridge

    Hi guys, I tried to calculate the Vos and Isc and both of them are zero..so the Thevenin's resistance is 0/0=undefined. How do I calculate the resistance when Vos/Isc fails,such like the wheatstone bridge?
  3. J

    Engineering Thevenin Equivalent for circuit with diagonal resistors

    Homework Statement Hi everyone! I'm trying to find the thevenin equivalent for part A of this circuit: http://imgur.com/4Jdg8w8 Homework EquationsThe Attempt at a Solution I first remove part B, that is, open circuit it entirely. Then I try to find Voc across the two terminals that are open. I...
  4. A

    Is a Small Output Impedance Desirable for Passing on Voltage in an Amplifier?

    Hi, I'm trying to find the output voltage of a load attached to the output of a common emitter amplifier. The collector is represented as a current controlled source. Attached to current source are two resistors, ##R_{C}## and ##R_{L}##. The circuit is already in Norton's equivalent circuit...
  5. W

    Solve Thevenin Resistance at Node 2: 10k || 10k

    For the following circuit: http://imagizer.imageshack.us/v2/640x480q90/674/aBkkRU.png I'm solving for the Rth at node 2. In the solution guide, it shows that the Rth = (10k || 10k). I don't understand how this is so, by following the resistence equivalent rules, these two resistance should be...
  6. N

    Solving for (β+1) in Thevenin Equivalent Homework

    Homework Statement I'm trying to understand where the (β+1) comes from. [b]2. Homework Equations vth=-βiR2 i+βi+is=0 vth=-β(-is/(β+1))R2 [b]3. The Attempt at a Solution vth=-βiR2 i+βi+is=0 vth=-β(-βi-is)R2
  7. O

    Thevenin Eq: Find Vth & Isc @ a,b

    1. Homework Statement Find the Thevenin equivalent circuit with respect to terminals a, b by finding open-circuit voltage and the short-circuit current. 2. Homework Equations i1+i2+i3..=0 v1+v2+v3..=0 i=v/R The Attempt at a Solution I was trying to shove this on my own for...
  8. V

    Engineering Thevenin Circuit: Help Me Verify My Solution

    Homework Statement Ive never done Thevenin equivalents before, and I am not sure if I have removed the correct "load component". Could someone please take a look @ my solution and let me know if I have done this correctly? Thanks in advance! I really appreciate it! Circuit Diagram...
  9. A

    Engineering Thévenin Circuit: Power Delivered vs Power Transferred?

    Homework Statement Q8. Circuit analysis plays an important role in the analysis of systems designed to transfer power from a source to a load. Maximum power transfer can best be described with the aid of the circuit shown in Figure 8a. A circuit is given (please refer to attached file)...
  10. B

    Engineering Thevenin equivalent of circuit and maximum power transfer

    Homework Statement Find the Thévenin equivalent of the circuit and the required value of the load for maximum power transfer for Z = 15 + j24 Ω . Homework Equations Voltage divider equation and Z_{in} = Z_{load} 'complex conjugate' for maximum power transfer. The Attempt at a...
  11. B

    Engineering Thevenin equivalent of resistor only circuit

    Homework Statement Find thevenin equivalent of resistor circuit Homework Equations The Attempt at a Solution This may be a dumb question, but does a thevenin equivalent NEED to have a voltage source? On my final exam there was a question that asked for the thevenin equivalent of...
  12. M

    Thevenin Equivalent: Calculate Eth & Rth

    I need the thevenin equivalent to this circuit, I've calculated Eth and Rth but i don't think my answer is correct
  13. I

    Engineering Resistors in parallel Thevenin circuit

    When calculating Rth, they took the parallel combo of he 40 kilo ohm and 160 kilo ohm resistors, then they added the 8 kilo ohm resistor that's in series with the combo. Maybe I'm having a brain freeze or something but how are the 40 kilo ohm and 160 kilo ohm resistors in parallel? They don't...
  14. P

    Thevenin equivalent for an AC circuit

    Homework Statement I have the network attached below. I need to find the open circuit voltage and short circuit current between A and B and then use these to find the Thevenin equivalent for the circuit. The Thevenin equivalent voltage is of the form VTsinwt and the equivalent impedance is...
  15. dwn

    Engineering Thevenin AC Circuit Homework: Solve & Analyze Results

    Homework Statement Image Attached Homework Equations Thevenin, Series, Parallel The Attempt at a Solution j10(12-j34) / (j10+12-j34) = (340 + 120j) / (12/j24) 1.67 + j13.3 or 13.44∠82.4° Now why can't I just use this equivalent resistance and multiply by the current source (22∠30°)...
  16. gfd43tg

    Thevenin equivalent with dependent current source

    For this problem, I added in an external source, and found an expression for the external current in terms of ix. Then I divided Vex/iex to get the Rth. Then I did superposition to find the Vth. I had some troubles getting rid of the extra currents, particularly i3 and i2. I was wondering if...
  17. S

    Finding Thevenin Voltage w/ Voltage Sources & Zener Diode

    Homework Statement http://l.bitcasa.com/-QwLBhUK Here is the problem statement Homework Equations Vth = V1*R2/(R1+R2) Rth = R1*R2/(R1+R2) Vth - Rth*Id - Vz = 0 The Attempt at a Solution http://l.bitcasa.com/4ycq3BMN Here is my attempt at a solution. I am having...
  18. J

    Engineering Finding the Thevenin voltage for the circuit.

    1. For the following circuit, i must find the thevenin's resistance and voltage. Using R_th = 1/r1 +1/r2 may be effective in finding resistance and V_th = Vout*(R/Rt) may be effective in finding voltage i have managed to find the thevenin's resistance to be 2.19ohms. I attempted to find the...
  19. D

    Is Using Norton and Thevenin Equations to Find Voltage Correct?

    Homework Statement find the voltage by using norton and thevenin equation is this method correct?
  20. gfd43tg

    Thévenin equivalent with dependent source

    Hello, I had read in my textbook that when a dependent source is in a circuit, and you wish to find the thévenin resistance, then the method to solve for the thevenin resistance is to turn off the independent sources and add an external voltage, then find the external current. The external...
  21. gfd43tg

    Solving Thévenin Equivalent Circuits: Confused by Different Methods

    Hello, For thévenin equivalent circuits, I thought current sources are replaced with open circuits and voltage sources are replaced with short circuits. In this video, the guy replaces both with open circuits, so I am not understanding how that works. Because of all the different...
  22. J

    Question on Thevenin Equivelant Circuits

    I am currently attempting to find the Norton Equivelant circuit of a given complex circuit. It only provides a dependent source, no other sources are present. How is it possible a current is even present? With no voltage source, and only a dependent source of current, wouldn't it be impossible...
  23. gfd43tg

    Find Thevenin Equiv at (a,b): Troubleshoot Currents

    Homework Statement Find the Thevenin equivalent circuit at terminals (a,b) of the circuit below: Homework Equations The Attempt at a Solution my currents aren't adding up right. When I try to solve for Ix using my two equations that should find it, I get different answers.
  24. gfd43tg

    Engineering How Do You Determine the Thevenin Equivalent Circuit for Complex Networks?

    Homework Statement Find the Thevenin equivalent circuit at terminals (a,b) for the circuit below. Homework Equations The Attempt at a Solution I am having a conceptual issue for this circuit. I can't combine any of the resistors, and my gut is telling me that something about the...
  25. M

    Engineering What is the Thévenin equivalent of this circuit?

    Homework Statement Problem located in attachment.Homework Equations Parallel, series and wheatstone bridge equations for resistorsThe Attempt at a Solution Converted the circuit to look less confusing. Work shown in other attachment. I am simply using the equations relating to simplifying...
  26. T

    Thevenin and Norton Equivalent

    Homework Statement For this problem (pic attached) I did the open circuit calculations and found V1 (6v) and V2 (4v) and I know they are correct. However I am not sure if my Voc and Isc (open circuit voltage and short circuit current) calculations are correct. The Attempt at a Solution...
  27. P

    Thevenin Equivalent: Solving Circuit Problems

    Homework Statement http://postimg.org/image/5wtty6dvr/ I'm trying to find the Thevenin equivalent of the circuit on the left side and but having trouble in getting the open circuit voltage. Does no current flow through R3 since that way leads to a dead end?
  28. O

    Electronics: Find Thevenin equivalent voltage & resistance, etc.

    Homework Statement http://imgur.com/w5AQ1A8 As shown in the image: In the circuit below R1=100Ω, R2=1000Ω, R3=99Ω, R4=1000Ω, R5=10Ω, and V=10V. (a) Relying on the Thevenin theorem, find the equivalent voltage and equivalent resistance for the circuit below when the resistor R5 is taken out...
  29. A

    Engineering [Circuits] Finding the Thevenin and Norton Equivalents #3

    Homework Statement Homework Equations The Attempt at a Solution Attached to this post. I had to take the absolute value of Rth. What did I do wrong to get a negative value for Rth?
  30. A

    Engineering [Circuits] Finding the Thevenin and Norton Equivalents #2

    Homework Statement Homework Equations The Attempt at a Solution Attached to this post. I'm not sure how to proceed.
  31. A

    Engineering [Circuits] Finding the Thevenin and Norton Equivalents

    Homework Statement Homework Equations The Attempt at a Solution Attached to this post. It seems that the answers are wrong but I'm not sure why.
  32. I

    Engineering Thevenin Circuit: Understanding Parallel and Series Paths in Resistors

    Can someone explain (in terms of the voltage and current if possible), why R3 and R2 are in parallel and why R1 and R3 are in series? Thanks
  33. I

    Engineering Question on voltage in a Thevenin equivalent circuit

    I am trying to refresh my basic electricity knowledge so the questions might be a little stupid lol. 1) Am I correct in saying that the voltage, V1, across the 6 ohm resistor is equal to the VOC? 2) Why isn't the voltage across the voltage source, V2, equal to V1 and VOC? I thought that...
  34. M

    How to calculate R thevenin (Circuits)

    I am not understanding how Rth is calculated.. What I've been doing is visualizing the path that the current would make. Rth is then the equivalent resistance of those resistors that current travels through. Is that how it's suppose to be done? Anyways... if you look at my pictures... the...
  35. A

    Engineering [Circuits] Computing the Thevenin Equivalent #2

    Homework Statement Homework Equations The Attempt at a Solution I am trying to find the equivalent resistance for part b. First, we turn off independent sources. We open circuit the 2A source and we close circuit the 30V source. We're left with two resistors. Are they in series or parallel...
  36. A

    Engineering [Circuits] Calculating the Thevenin Equivalent #1

    Homework Statement Homework Equations The Attempt at a Solution I got ##R_{ th }=4\quad Ω## easily but I am having trouble finding ##V_{th}##. Assume the negative terminal of the 32V voltage source is ground. Here is the nodal analysis at node 1: $$\frac { 32-V_{ 1 } }{ 4 } +2=\frac { V_{...
  37. B

    Thevenin equivalent resistance

    i am confused at the 20v voltage since it becomes short circuit.i had started reading the circuit from the left side 1M ohm and 2k ohm are in parallel and in series with the 3k.knowing that current wants less resistant ways it will go to the killed voltage source...after that I am wasnt able to...
  38. S

    Thevenin Potential Homework: Simplifying a BJT Amp Frequency Model

    Homework Statement Hey guys, There is an example in the textbook regarding simplifying the frequency model of a BJT amplifier. It ends up determining the potential across the highlighted resistor I attached. The formula that the textbook is rather different than the one I determined to be the...
  39. L

    What is the Methodology for Solving a Complex Circuit with Thevenin Equivalent?

    Homework Statement http://imgur.com/izloBbW http://imgur.com/izloBbW Essentially I've been attempting to solve the first question. Homework Equations I'm mostly concerned on the methodology to solve such a question; So far I've been attempting the following: As always with these questions...
  40. J

    Thevenin Equivalent Resistance

    Homework Statement Where R1 = 2.4k, R2 = 2.9k, Vs1=7V, Vs2=7v and Is = 4mA For this circuit I need to find the Thevenin Equivalent resistance. Homework Equations The Attempt at a Solution *Just a heads up, all my loop analysis stuff is going clockwise* I've tried everything to try to solve...
  41. Y

    Engineering Solving Thevenin Circuit Time Constants

    Homework Statement Find time constant T. Homework Equations V/i = Rth The Attempt at a Solution Not sure how to do it.
  42. S

    How to apply Thevenin and Norton Model

    Hello guys, I'm having some trouble reading two circuits : Here they are : In the first one I need to Determine the Thevenin then the Norton Equivalent of the circuit. For the second one I have to find expressions of the current I1 flowing through the R1 resistor, I2 in R2 and then...
  43. M

    Engineering Finding the Thevenin equivalent circuit.

    Homework Statement Find resistance R so that maximum power is transferred to this resistor. http://i.imgur.com/XsxTFCq.png Homework Equations Rth = Voc/Isc The Attempt at a Solution I tried to find the Thevenin equivalent circuit across the resistor R because the Thevenin resistance must...
  44. N

    Engineering How Do You Simplify a Circuit Using Thevenin's Theorem?

    Homework Statement Above given is the circuit I am supposed to simplify where the 1/5Ω resistor is the load. I'm unsure how to convert this circuit into an equivalent Thevenin Circuit. Homework Equations V = I*R (Ohm's Law) The Attempt at a Solution Using Microcap and it's...
  45. S

    Solve Thevenin Problem: Find Rth & Vth for Points A+B

    Homework Statement Use thevenin techniques to find the equivalent circuit (Rth and Vth) to which the points A + B are attached. Homework Equations Kirchoffs loop rules V=IR The Attempt at a Solution I have indicated my chosen loops in blue. I am not quit sure at this point how to...
  46. R

    Engineering Thevenin Equivalent of a Circuit

    Homework Statement Find the Thévenin equivalent of the circuit shown in FIGURE 1. Homework Equations Any two-terminal network can be replaced by an equivalent circuit consisting of a voltage source and a series resistance equal to the internal resistance seen looking into the two...
  47. C

    Find Thevenin equivalent, but off by a small amount

    Homework Statement Apply source transformation to find the Thevenin equivalent circuit Homework Equations voltage division, source transformationThe Attempt at a Solution Simplify the far left current source to get Then Vth of this = (50V + 20V)*(100/200) = 35V and Rth of it = 100||100 =...
  48. R

    Thevenin Equivalents and Opamps

    Hey, guys.. So I am taking some electrical engineer classes and i could really use your help on one of the questions I am stuck on. So my proff talked about opamps and said we would not be using positive feedback and skipped it. Question number two has both positive and negative feed back. I...
  49. C

    Engineering AC Circuit with Source Transformation; find Thevenin equivalent

    Homework Statement Use source transformation to find the Thevenin equivalent circuit with respect to terminals, a, b. Homework Equations Voltage Division: (V in)*(R1/R1+R2) Thevenin / Norton / source transformation procedures RTh = RNo VTh = INo*RNo Polar...
  50. X

    Thevenin and Norton Equivalent

    Homework Statement Find Vt and In Homework Equations KCL The Attempt at a Solution I found Rt to be 5.94 ohms (1/(1/7+1/9)+2) Then I am stuck. I know to find Vt (which is equal to Vopen circuit), I have to do a KCL in an open circuit, so my KCL equation is 2+Voc/3=Voc/4 So...
Back
Top