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

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  1. M

    What is the Thevenin Equivalent with Dependent Sources?

    hi everybody, please help me if you can the question in this link . i try many many times but i don't know how i can solve thevenin equivalent with dependent sources. tomorrow i have a home quiz on this question. http://imageupload.org/?d=49E036571
  2. M

    Thevenin equivalent of lattice network

    Homework Statement Find the Thevenin equivalent network of the lattice network (see attached), viewed from points As and Br (terminals Bs and Ar are not connected to anything). Homework Equations The Attempt at a Solution Without the resistance f, the problem is quite simple. I...
  3. M

    Understanding Thevenin Equivalent: Why Zeq = 0

    For the circuit below, can someone please help me understand why Zeq = 0 (in words...not by solving): I know Vth = 50<0° since this is the voltage drop across the parallel elements. I don't understand why the equivalent impedance would be 0. I know when you shut off a voltage source...
  4. S

    MATLAB MATLAB Thevenin: Find Solution to Impedance Problem

    Hello all, been a fan for a long time but finally joined to ask a question =P Solving Thevenin using MATLAB Problem is when i add in imaginary numbers ex: find Thevenin of circuit; current source xL and xC all in series. i get equations -i + xL(i1-i2) + xC(i1-i2) = 0 xL(i2-i1) +...
  5. M

    Thevenin and Notron Equivalen sources, external to load

    Homework Statement Solve power dissipated by RL Find a new values for RL that will receive maximum power solve for the maximum power that can be delivered Homework Equations Nodal analysis mesh analysis superpostion etc.. The Attempt at a Solution Hello guys, I've beein...
  6. M

    Engineering Thévenin resistance when branch is 0V (RC circuit)

    Homework Statement Prior to t=0, switch is in position A (for long time). Afterward, switch is in position B. We need to derive the equation for vc. Homework Equations v(t)=v(\infty)+[v(0)-v(\infty)]e^\frac{-t}{\tau} \tau=RC The Attempt at a Solution at t=0...
  7. Twinflower

    Thévenin resistance and Load resistance vs maximum power

    Homework Statement This is the network. The problem states that a new resistor is put between A and B, in parallel with R4. I should find the ideal resistance for this load resistor and show that this is indeed the ideal resistance for maximum power output. Homework Equations...
  8. R

    Engineering Finding Thevenin Equivalent circuit (Voc)

    Homework Statement [PLAIN]http://dl.dropbox.com/u/9699560/EE%20Problem.jpg (I added the text V1, V2, and Voc to the image). I'm only trying to find Voc because I got the wrong answer. I got Isc correct. Homework Equations Basic node voltage analysis techniques. The Attempt at a Solution...
  9. D

    Simple Thevenin equivalent resistance problem

    Gentlemen. Homework Statement Calculate the Thevenin equivalent resistance. Homework Equations Rseries - Rtot = R1 + R2 + ... + Rn Rparallel - Rtot = 1/(R1^-1 + R2^-1 ... + Rn^-1) The Attempt at a Solution As the picture shows, The second ohm-meter tells me 5.7 Ohms is...
  10. Twinflower

    Determine resultant resistance in network (Thévenin)

    Homework Statement I need to calculate the resultant resistance between points A and B The |-| parts are short curcuited ideal DC power supplies (illustration only) This is the circuit: Homework Equations R_P = \frac{1}{\frac{1}{R1}+\frac{1}{R3}+\frac{1}{Rn}} R_S = R_1 + R_2 +...
  11. E

    Thevenin Problem Homework: Find Current When RL is Short

    Homework Statement This one has a few parts, so let's start with part a. See attachment for circuit. I've got two drawings in the attachment. I'll label them A and B. Image A is the original circuit. Homework Equations None. The Attempt at a Solution My first step is to find set...
  12. O

    Engineering Thevenin Theorem - Open Voltage and Short Circuit Current

    Homework Statement Homework Equations Thevenin Theorem, Kirchoff's Voltage Law, mesh analysis The Attempt at a Solution I'm kind of confused as to how to approach this question as a whole because I'm getting put off from the two voltage sources. I was thinking that maybe I could use mesh...
  13. P

    Constraint on Thevenin impedance

    Let's say we have a circuit composed of simple linear circuit elements (resistors, inductors and capacitors). Now we calculate the Thevenin equivalent circuit for some load within this circuit, and we determine the Thevenin impedance, Z_t. My question is this: Is it generally the case that...
  14. F

    Engineering Simple Circuit THEVENIN or Norttons

    Homework Statement I have this problem its been bothering me for a while. The problem asks to be solved by method of superposition. I have already solved it but I am sure it can also be solved by thevenins or nortons. I can tried many different combinations but i can't seem to get it. Please...
  15. S

    Thevenin theorem and norton theorem

    can someone tells me what is purpose of using thevenin"s and norton"s theorem?? and what these theorems contribute to electrical engineering's field? thank you
  16. P

    How to Correctly Find the Thevenin Equivalent Circuit?

    Homework Statement Find the Thevening Equivalent Circuit for the following circuit: Homework Equations KVL, KCL. The Attempt at a Solution First of all, I calculate the current in the middle mesh, which I'll call i2: - j25 = ({i_2} - {i_1})(3 + j4) + {i_2}(10) where i1...
  17. PainterGuy

    Vth voltage in thevenin theorem

    Hi, :smile: Please have a look on Example 4.8. There are two scans. 1: http://img585.imageshack.us/img585/6673/understandingthevenin1.jpg 2: http://img818.imageshack.us/img818/3301/understandingthevenin2.jpg First we find the equivalent resistance of the circuit on the left of...
  18. PainterGuy

    Understanding thevenin theorem

    Hi, :smile: I don't think this fits into homework section because in the first place it's not homework related problem, and secondly I'm only concerned about understanding the theorem. If you think it doesn't belong here, then please forgive me, and I request you to move it to other section...
  19. M

    Short Circuit Current Calculation

    i am trying to find the short circuit current for the following circuit. the RL is the thevenin equivalent resistance. i am trying to find the current when RL is a wire (short circuit). by KVL, i have IR1 + \mu1(v2-v1) + IR2 + \mu2(v3-v1) + IR3 = 0 (the above is not formatted...
  20. M

    Engineering Calculating Thevenin Equivalent Voltage for a Complex Network

    I need help finding the thevenin equivalent voltage for the following network: i did source transformations so that i could analyze it using the node voltage method. my equations are: I1 = v1 (a) vx + vx - vT = v1 + av1 - bv1 2vx - vT = v1 + av1 - bv1 (b) vT - vx + vT = bv1 2vT - vx = bv1...
  21. S

    Engineering How Do You Calculate Thevenin Equivalent Circuits and Current Flow?

    Homework Statement A variable resistor (RL) is connected to an unknown circuit. It is found that the maximum power that can be dissipated in the resistor (RL) is 10W, and that this occurs when the value of the resistor (RL) is 25ohms. Derive the Thevenin equivalent circuit for the unknown...
  22. W

    Engineering Does a Thevenin Equivalent Circuit Accurately Predict Power in Variable Loads?

    In a thevenin equivalent circuit are you able to find the power used in the circuit by the variable load? I have a circuit where the variable load is in parrallel I was thinking the power used in the original circuit by the variable load would be different than in the equivalent because it is...
  23. J

    Thevenin Equivalent with dependent source

    hi :smile: I'm having some trouble figuring out the Thevenin equivalent for this circuit. As you can see, there are two dependent sources (current dependent current source & voltage dependent voltage source) and no independent source. I have started trying to analyse the circuit by...
  24. T

    Solving R_Thevenin in Circuit: Ignoring R_3?

    When solving for R_{Thevenin} in the circuit below, why do you ignore R_3? Is it because the voltage through R_3 is zero? [PLAIN]http://img197.imageshack.us/img197/88/thevenin.png
  25. M

    Engineering Finding Thevenin Equivalent Circuit for BJT Problem

    Homework Statement The question asks to find the Thevenin equivalent circuit as shown in the attachment. (It's a BJT problem, but I'm having difficulty with the first part). Homework Equations Where are terminal points I need to worry about when making it an open circuit? That's the biggest...
  26. S

    Thevenin Equivalent Circuits with Dependent Source

    May anyone please help with the method of getting Thevenin Equivalent resistance (RTH) for the attached circuit. I have already found VTH to be 8V. Sim
  27. S

    Thevenin with dependent voltage source

    Homework Statement Find Rthev as seen by terminal (a,b) http://cid-3c099006138591f8.office.live.com/self.aspx/Pictures/IMG^_0337.JPG Homework Equations Can somebody point me to the right method to solve this problem. I know how to solve when there is a dependent source, but the dependent...
  28. C

    Explaining Thevenin Equivalent?

    http://img69.imageshack.us/i/circuitf.jpg/ Can someone explain what was done to go from Figure 4 to Fig 5? I tried source transformations but I cannot simplify it to that.
  29. N

    Engineering Thevenin equivalent circuit parameters

    Homework Statement https://www.physicsforums.com/attachment.php?attachmentid=32837&stc=1&d=1299373667 Determine the Thevenin equivalent circuit parameters, VTh and RTh, referred to terminals A and B of the circuit shown below? Homework Equations The Attempt at a Solution My...
  30. Saladsamurai

    How Do You Calculate Short Circuit Current in Thevenin Equivalent Circuits?

    Homework Statement I need to find the Thevenin equivalent of the circuit shown: I found the open circuit voltage (VAB) by noting that VAB = V3 and used the voltage division V_{AB} = V_s\left ( \frac{R_3}{R_1||R_2 + R_3}\right ) = 12\V I am having a little trouble finding the short circuit...
  31. Saladsamurai

    Circuits: Thevenin Equivalent Circuit

    Homework Statement Homework Equations The Attempt at a Solution I am not getting this at all. I know that I need to calculate the open circuit voltage Voc and the short circuit current Isc. I really have no idea how to find Voc. There is some conceptual leap I need to make...
  32. Y

    Thevenin Voltage and Resistance Calculation for Circuit with Current Sources

    Homework Statement Find the thevenin voltage and thevening resistance of the circuit. [PLAIN]http://img573.imageshack.us/img573/2525/thevening.png The Attempt at a Solution The posted answers for the question are 5v and 1k ohm. But I can't see how the thevenin resistance is 1k...
  33. M

    Help Calculating Thevenin Resistance

    Homework Statement I attached my question below. Homework Equations The Attempt at a Solution I believe Vth is just 10 V, but I am having trouble calculating Rth. Can someone help me get started? Thank you.
  34. R

    Thevenin Equivalent with a dependent source

    Find the Thevenin Equivalent circuit between A and B the circuit is in the attachments... i don't know how to start and don't know what it meas "Between A and B" and i never encountered a problem with a dependent source. Thanks...
  35. B

    Thevenin equivalent of a network

    Homework Statement The question is to find the Thevenin equivalent of the network across the terminals a,b. The circuit is as follows:-- The solution is Zth = 12.166 angle(136.3*)ohm and Vth = 7.35 angle(72.9*) I can find out the Vth, that's easy. But I can get the Zth right coz there...
  36. K

    Thevenin Norton Theorem: Explanation and Example for Easy Understanding

    Hi everyone, i didnt solve that question , could anyone help me for solution ? thanks a lot [PLAIN]http://img243.imageshack.us/img243/6398/questionk.jpg
  37. N

    Thevenin Eq. with controlled current source

    Hi! So, I've got this problem, and it's doing my head in a bit; http://yfrog.com/mtthevcsj I'm not entirely sure where to begin with this one. I've tried a few things, and hit dead ends pretty quickly on all of them; trying to find vx, Voc, Isc, node analysis by treating terminal 'a' to...
  38. S

    How Do You Find the Thevenin Equivalent Circuit for Complex Loads?

    Homework Statement This is in norwegian but hopefully you can understand it. Here is the assignment and circuit: http://img835.imageshack.us/img835/3619/krets.jpg Find the equivalent Thevenin circuit when when RL is the load Homework Equations The Attempt at a Solution I really don't know...
  39. T

    Finding Thevenin eq of this circuit

    There's a problem in my book where it asks me to find the Thevenin and Norton equivalent circuit of the attached circuit, as viewed from AB. I believe I know the answer, but just had to check to be sure this is not a trick question? Isn't the Thevenin eq. circuit as seen from AB exactly the...
  40. D

    How Do You Calculate Thevenin Equivalents in Circuit Analysis?

    Homework Statement [PLAIN]http://d.imagehost.org/0018/enunciado.png It's in portuguese but what it's being asked is to find the Rth and Vth, the Thevenin equivalents for that network, in that cut point... V2 and all resistors values are known. Homework Equations The Attempt at a Solution...
  41. S

    How do dependent sources change the analysis of a circuit?

    Homework Statement Homework Equations v = IR The Attempt at a Solution Okay, so up until this point, I was doing okay... but now I'm stuck. I do not understand how I'm supposed to work with this because until now I have not had a dependent source. Am I supposed to start by doing a KCL on...
  42. T

    How Do You Calculate Thevenin Equivalent for a Battery with Different Loads?

    Homework Statement An automobile battery when connected to a car radio provides 12.5 V to the radio. When connected to the headlights, it provides 11.7 V. Assume the radio is modeled as 6.25 ohm resistor and the headlights are .65 ohms. Find the Thevenin Equivalent for the battery...
  43. T

    Solving Thevenin Equivalent Circuit: 300Ω, 100Ω & 25Ω

    Homework Statement I have this circuit (attached) and I am required to give the thevenin equivalent circuit...since its a current source, the first 300ohm resistor is ignored, right? but then is the 100 ohm and 25 ohm resistor afterwards taken to be in series of parallel, i took series...
  44. J

    Why Did the Author Not Short the 4V Source in Thevenin Resistance Calculation?

    Homework Statement Hi, I had a question about how my textbook finds the thevenin resistance (Rth) for this question I have already solved the thevenin voltage(3V) and I have a question about finding the Rth In the solution using a test current source of 1 A and I have been taught...
  45. L

    Find Thevenin's Voltage (VTH) Across Resistor R3 - Thevenin Theorem

    Find the the equivalent Thevenin’s Voltage (VTH) across resistor R3 for the circuit. -can anyone tell me what's your answer for the solution? -if i want to use current divider rule...how am i going to solve it? attempt solution: Vth=VR3=R3/(R1+R3+R2)*V = 8.33v
  46. K

    Engineering Thevenin based question - Mesh circuit

    Homework Statement First post here... Sorry it has to be a question. I'm currently studying electrical engineering at university. Anyway, I've hit a couple of these mesh type circuits in my workbook and have no idea how to tackle them? The question asks to solve using Thevenin's...
  47. D

    Unbalanced Scheering Bridge and Thevenin

    Homework Statement Find the magnitude and phase of the current flowing through the galvanometer whose internal resistance is negligible.C1=C, C2=0, Cx=2C, R2=R3=R, Rx=0 http://www.freeimagehosting.net/uploads/4ce4800510.png The Attempt at a Solution Magnitude of the current: Using the...
  48. jegues

    Thevenin Equivalent: Understanding Polarity in Circuits

    Homework Statement See Figure Homework Equations The Attempt at a Solution See figure. Did I do this right? I just want to make sure I'm understanding things correctly.
  49. xortan

    Engineering Thevenin Circuit Homework: Find Equivalent Circuit & Rth

    Homework Statement I need the find the thev. equivlaent circuit of the attached image The attempt at a solution I've tried using simulation software and the answers off the software are not what I am getting when trying to solve this. I know that when I find the Rth I need to use delta-Y...
  50. K

    How to Find Thevenin Equivalent Circuit | Step-by-Step Guide

    Homework Statement [PLAIN]http://img684.imageshack.us/img684/9092/asdrc.jpg given this circuit find the thevenin equivalent the 4 ohm resistor is the load The Attempt at a Solution at first I found Vth which is Vth = -10+20 = 10 V then i found Rth which is 6 Ohms but I am...
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