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. E

    Thevenin Voltage & Impedance with Dependent Source: Homework & Solution"

    Homework Statement Homework EquationsThe Attempt at a Solution How do I do Thevenin voltage and impedance with a dependent source? Any hints would be greatly appreciated.
  2. R

    Find Thevenin Equivalent of Circuit

    Homework Statement Find the Thorton equivalent of the circuit shown [/B] Homework Equations Voc=IscRs Rseries=R1 +R2+... Rparallel=R1-1+R2-1+... The Attempt at a Solution So, I thought I should first solve for the Rsource, by shorting all of the voltage sources: However, I don't think the...
  3. R

    Rth = (8 || 12) + 36 = 74.2 Ohms

    Homework Statement Find the thevenin equivalent of the cicuit shown below with V=500 V and i=10 A Homework Equations Voc=Vth Isc=VN The Attempt at a Solution [/B] So, to solve this, I used my instructors method of first finding the Rth. So, what I did was set the independent sources to...
  4. B

    Find thevenin equivalent resistance with diode.

    Homework Statement I have a circuit with a diode in it. I have to find the thevenin equivalent in order to reduce the circuit to a DC source, single resistor and single diode. How do I account for a diode when trying to find Rth and Vth? Do I just remove it and have it act as a short circuit or...
  5. Z

    Engineering Find the Thevenin Equivalent Circuit

    Homework Statement Homework Equations Node Voltage Method V=IR The Attempt at a Solution KCL at Node 1: KCL at Node 2: i is the current moving towards "a" I've simplified the two equations down but the problem I run into is that normally I'm able to write a third equation to define i0...
  6. magnetpedro

    Help Me Find Thevenin's Equivallent for the Circuit Impaired

    Hello guys, Can someone guide me through this problems solution? I need to find the Thevenin's Equivallent for this circuit, between A and B. I'm terrible at Circuits and I'm eager for some motivation and help. Thanks a lot in advance.
  7. Marcin H

    Thevenin Equivalent & Available Power?

    Homework Statement Homework Equations V=IR Node Voltage Thev/Nort The Attempt at a Solution So I set up my equations in the picture below, but I'm kinda confused about the Vx's in the equations. First, did I set these up correctly? If so, solving them I get that V2=0 which would mean my...
  8. Marcin H

    Engineering Thevenin & Norton Circuit with Current source?

    Homework Statement Homework Equations V=IR Thevenin/Norton The Attempt at a Solution I am trying to find the Voc, but this circuit isn't making sense to me. So to start we can ignore the 9ohm resistor and that branch for now when Finding Voc so you are basically left with the square...
  9. N

    Thevenin Theorem (where does Z Thevenin fit in?)

    Homework Statement [/B] (a) Calculate the load current using Thevenin's Theorem (b) Calculate the load current using Superposition Homework Equations N/A The Attempt at a Solution There have already been a couple of historical posts of this question but those threads don't give me any...
  10. YellowBelliedMarmot

    Engineering Thevenin Equivalent of AC RLC Circuit w/ Dependent Voltage

    Homework Statement Find Vth and Zth. frequency = 2kHz Homework Equations w = 2 * (pi) * f ZL = j w L ZC = -j / (w * C) V = I*Z ZR = R The Attempt at a Solution At first I tried using nodal analysis which I receive the value V = 0 v. I believe this is because this circuit only has dependent...
  11. D

    Engineering How do I find the Thevenin Equivalent of this circuit?

    Homework Statement I need to find the Thevenin Resistance and the Thevenin Voltage Homework Equations Vth =Rth I (Short Circuit) The Attempt at a Solution I know the answer is supposed to be Rth = 3Ω and Vth = 0.5V, but I couldn't get there with my method. I only get the Rth to be 3 Ω if I...
  12. K

    Determining Thevenin equivalent and time constant

    Homework Statement Homework Equations ; 3. The Attempt at a Solution [/B] Here is my thought process and assumptions. Without Vs1 and R2, the open-circuit current would be Vs2/R2, but I know Vs1 and R1 must be contributing in some way. I'm thinking of summing the Voltage sources and using...
  13. M

    Engineering What are the implications of Thevenin equivalent circuits on circuit behavior?

    Hiya, this is my first time posting so apologies for any errors in formatting. :oldsmile: I am confused as to whether when Thevenising a portion of a circuit is it to simplify BUT provide the same output characteristics, meaning the workings of the Thevenin part of the circuit may behave...
  14. N

    Engineering How can redrawing a circuit help in simplifying a Thevenin circuit?

    Hi, I am struggling to simplify this into a thevenin circuit. Firtsly I am unsure how the zener diode works and why the R1 is not required.(so does it create a voltage drop across the whole loop and , how does it work exactly?) Also unsure if the resistors are in series or not. I think you are...
  15. Naakicibi

    Resistor parallel to short circuit when finding R_thev ....?

    (sorry, I couldn't figure out how to insert an image from my drive) I have a problem where in finding the thevenin resistance I take out my independent sources and as a result I'm left with a resistor parallel to a short circuit. Should I ignore this resistor when calculating equivalent...
  16. G

    Thevenin equivalent resistance problem

    Homework Statement Homework Equations V=IR The Attempt at a Solution [/B] I found that the current around the circuit was 5mA using kirchhoffs law ( i think) If this is true then the T.E.V should be the voltage across the 120ohm resistor which is .6V (120*5e-3). Now I'm stuck and not sure...
  17. G

    Thevenin's circuit analysis. Multiple voltage sources

    Hi, i am halfway through one of my assignments and i require some assistance. I do not seek the answer to the assignment just a little boost to my knowledge. 1. Homework Statement Basically, if i am calculating the Thevenin's voltage and the resistor i have removed that is in question has a...
  18. M

    Finding Thevenin Equivalent with Dependent Source

    Homework Statement I am trying to find the Thevenin Equivalent of this circuit Homework Equations Using KCL and node voltage The Attempt at a Solution I found the open circuit voltage for the thevenin voltage so far by the mesh current method, and now I am trying to find the closed circuit...
  19. kostoglotov

    Thevenin Equiv with just Capacitors

    Homework Statement imgur link: http://i.imgur.com/TWB5rRu.png Homework EquationsThe Attempt at a Solution I can find the equivalent capacitance, 10F, but I'm not really sure how to find the equiv. Thev. voltage. I figured that with the voltage source present, half the voltage will be lost...
  20. Marcin H

    Thevenin Equiv.: Solving Homework Equation V=IR

    Homework Statement Homework Equations V=IR The Attempt at a Solution I am not sure if I did this problem correctly. To find the thevenin equivalent do you have to get the circuit into series first? I combined the resistors in parallel and found the Vth to be 6V and Rth to be 8ohms. Is...
  21. C

    Thevenin voltage and impedance

    Homework Statement Find the maximum power on a impedance Z. Homework EquationsThe Attempt at a Solution I got as Thevenin impedance Zt=4+j4 and Ut= 32 V, but since my solution for power is wrong, something is wrong with either impedance or voltage (or both). If point A is above Z, and point B...
  22. M

    Thevenin Voltage Value Homework

    Homework Statement I calculated theoretical value of resistance - I assumed that R4 and R5 are in series and parallel to R2 and R3 which are in series, because I've considered B as the starting point - this is the method I was taught, but I don't know any method of calculating the voltage...
  23. D

    Engineering How Do You Calculate Thevenin Voltage Using Superposition?

    Homework Statement http://puu.sh/lQPvh/d0efa216ff.png Homework EquationsThe Attempt at a Solution http://puu.sh/lQPAR/2456db4783.jpg http://puu.sh/lQPCJ/f142c25f63.jpg http://puu.sh/lQPER/5eb4af107e.jpg Is this correct? I used principle of superposition to calculate the Thevenin...
  24. Y

    Calculating Thevenin Equivalent Doesn't Seem Practical

    Ok, so I know the point of the Thevenin is to make a simpler circuit so that that it results in the same current being sent to the other connected circuit. But why do we go through all the hassle of computing the Thevenin Voltage when we could choose any arbitary Voltage and a Resistor that...
  25. jdawg

    Engineering How Do You Determine Thevenin Equivalent Circuits and Maximize Power Transfer?

    Homework Statement Find the Thevenin equivalent circuit for the circuit shown. You will need to find VOC and then use the test source method to find the Thevenin resistance. Using the Thevenin equivalent circuit,determine the load resistor that results in maximum power transferred to that load...
  26. H

    Thevenin equivalent sc current

    Homework Statement [/B]Homework Equations [/B] Node-voltage method mesh current methodThe Attempt at a Solution [/B] My problem is with the short-circuit current. There are three meshes when you join the nodes a and b. Let i1 be the cw current for the bottom right mesh, i2 be the ccw...
  27. jdawg

    Thevenin Equivalent Finding Isc

    Homework Statement Homework EquationsThe Attempt at a Solution So far I've found Vout, but I'm a little confused about finding ISC. The solution to my homework says that in Figure 2 the 10 ohm resistor gets by passed due to the short across the open voltage. Why does this happen? Thanks!
  28. T

    Determining Thevenin equivalent resistance

    I am currently learning about Thevenin equivalent circuits and was posed with the question attached to this post. I was wondering why I3 is equivalent to the current formed by a short circuit between nodes a and b. Shouldn't the current between a and b be I1 + I2 + I3 since in a short circuit...
  29. jdawg

    Find V0, ISC, & RTH: Thevenin Equivalent Homework Soln

    Homework Statement Find the open circuit voltage V0, short circuit current ISC, and RTH, Homework EquationsThe Attempt at a Solution I found the equivalent resistance to be 20 ohms(just by combining resistors in parallel and series) and V0 to be 30V, which I think might be wrong. I did a...
  30. F

    Engineering Exercise about Thevenin equivalent circuit

    Hi all :) I'm trying to figure out the Thevenin equivalent of this circuit: I start by switching off every source and calculating the equivalent resistance: RTh = RN = (6 + 14) || 5 = 4 Ω Then I proceed with finding the voltage at 2. I note that the nodes between 1 and 2 form a...
  31. P

    Two methods -- neither works, thevenin

    Homework Statement we are asked to find the tension between the R6 = 20 ohms resistor, using thevenin[/B] Homework Equations the given solution for Ethev is 27.78 The Attempt at a Solution is seen in the pictures below thank i really appreciate your help as it gets frustrating not to know...
  32. S

    How to selfstudy to learn (electronics) network analysis (Thevenin, Norton)?

    I am learning network theorem,my syllabus includes application of kcl,kvl,thevenin and norton theorem,superposition theorem,maximum power transfer I studied it from malvino,its quite good! But lack of solved problems! Actually I am finding difficulty while solving networks with double voltage...
  33. S

    AC nodal anaylsis to find V thevenin

    Homework Statement Here is the circuit. I have to solve for V Thevenin I am having trouble figuring out what I am doing wrong here. I need to solve for Vth and I do, but it does not match with what my TA posted as the solution. [/B] Homework Equations The equations I set up are the same as...
  34. S

    Thevenin technique solving problem -- getting wrong answer

    Hi Can you tell me please what I am doing wrong here I need to find the Vc function after we close the switch. To do this, I calculate the Thevenin equivalent circuit. I calculate Vth to be 21/(60+30) times 30, which makes 0.7V but why the answer is 7V? Basically the answer is Vc=7x(... which...
  35. R

    Thevenin and norton theorem question

    Why in thevenin theorem, we take the equivalent resistance in series to the load resistor, while in norton theorem we take the equivalent resistance parallel to the load resistor. Thanks.
  36. D

    Thevenin Theorem based Problem

    Homework Statement Q. I have to write an equivalent circuit for the transformer coupled RLC load.My answer is not matching with that of book . I am uploading my work and the answer given in book. Homework Equations It is an N:1 ideal transformer. The Attempt at a Solution
  37. S

    Finding Thevenin Voltage in a Complex Circuit

    Homework Statement The question is in the photo attached. Homework EquationsThe Attempt at a Solution I have found the Thevenin voltage as the 10 and 20 ohm resistors are in series (30 ohms) and the 50 and 40 ohm resistor are in series (90ohms). The 30 and 90 ohm resistors are in parallel so...
  38. J

    Sign of the Thevenin resistance equation

    Here is my problem: when trying to find Rth for a circuit with dependent sources, I excite the circuit a voltage Vo, and then proceed to find the resulting current Io. Finally, I use the equation Rth = Vo / Io, with a plus (+) sign. The way I see it, Io enters the positive side of Vo, so the...
  39. L

    How Does Adding a Resistor Affect Thevenin Equivalents?

    Homework Statement I'm having problems with PF's cut and paste images. They are not showing up on the actual webpage only on my editor. See these: http://i.imgur.com/mKfn27m.png http://i.imgur.com/jCO2JRM.png http://i.imgur.com/oUWFsuI.png I created the above problem by modifying this...
  40. T

    Thevenin and Norton equivalent circuits

    Hi guys, Sorry if all you guys think this question is too easy. But I have a hard time to understand how to group the resistor. I suppose to find the the thevenin and Norton equivalent circuit. This is what i think about the combination of resistor. Req1= RL+1k Req2= Req1 ll 3.3k (3.3k after...
  41. I

    Voltage generators in open edges and Thevenin's generator

    Homework Statement I hope you can see the picture clearly. Someone drew lines over it,so please try to ignore that. The problem here is to determine the current of ideal current source Ig, if following parameters are known: -E1=50V, E3=30V -R1=200Ω, R2=500Ω, R3=3kΩ, R4= 10 kΩ -C=0.7 μF...
  42. O

    How Do You Calculate Thevenin Equivalent Circuits?

    Homework Statement Determine the Thevenin equivalent with respect to the terminals a,b Homework Equations Rth=Voc/Isc The Attempt at a Solution I'm doing this practice problem and I calculated the the short circuit current below: 500uA*100ohm/(100ohm+1310ohm)= 35.460 uA since 80*ib=current...
  43. P

    Thevenin and Norton Equivalents

    Hello physics community! This is my first post to PF and I hope to contribute much more as time goes on. I am having serious trouble understanding Thevenin and Norton equivalent circuits, more specifically on how to find a circuit's equivalent. It only seems appropriate that to find a circuits...
  44. B

    Engineering Thevenin equivalent circuit with dependent source

    Homework Statement http://oi57.tinypic.com/263tqvr.jpg I decided to try using mesh currents for thisFirst mesh is IA, second IB, third, ICSo I have the equations IA = 500 μA 1310 IB + 100(IA - IB) = - 4*10-5V2 IC = -80IBAre these equations correct so far? I get the feeling they're not
  45. W

    Calculating Thevenin Resistance and Current in a Complex Circuit

    Homework Statement The circuit looks like this: http://i.imgur.com/QtgiCdR.png R1= 10 Ω R2= 8 Ω R3= 3 Ω R4= 5 Ω R5= 2 Ω V= 15 V I'm trying the find the current in R1 by using Thevenin's Theorem. Homework Equations Basic Circuit Analysis Formulas The Attempt at a Solution So I calculated...
  46. A

    How Do You Calculate Thevenin Equivalent Circuit Without a Load Resistor?

    Homework Statement I am to find the thevenin equivalent circuit without the load resistor (to the left of terminals a &b Homework Equations From class notes: 1- Remove the load resistor 2- find the open circuit voltage across a & b 3- Remove all voltage sources (replace with short circuit)...
  47. E

    Understanding Thevenin's Theorem

    Homework Statement You have a circuit (attached pic) and want to find the Thevenin equivalent resistance and voltage. Homework Equations See below The Attempt at a Solution OK< here's what confuses me. If I simply look at the total resistance of the circuit from A and B, it seems to me that...
  48. G

    Finding Vth from Thevenin Equivalent of Circuit

    Homework Statement Hello everyone! I am attempting to find the thevenin equivalent for a circuit. I've got the Rth but am not struggling to find the Vth Homework Equations I have included a screen shot of the circuitThe Attempt at a Solution I thought the best way to go about it was to...
  49. G

    Need Help With Thevenin Equivalent Question

    Hi everyone. I need some help with regards to a question on Thevenin's equivalent. I attempted to solve it in 2 ways but I got different answers when I tried to do it another way. However, I am not sure of my answer as I do not have the answer key at the moment. The picture below shows one of my...
  50. L

    Bootstrapping Amplifiers, and Signal Bypasses

    Hello, I am reading The Art of Electronics, and I have two specific questions regarding examples it has introduced. I am dealing with bipolar transistors the current chapter. I think my questions mostly stem from not understanding concepts. The text has introduced the technique of...
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