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. C

    Engineering Find load impedance / (Thevenin / Norton too) with RLC & AC circuit?

    Homework Statement For the circuit shown, what value of ZL results in maximum average power transfer to ZL? What is the maximum power in milliwatts?Homework Equations P max = (VTh)2/4RL Thevenin, Norton procedures, voltage division, current division, etc etc The Attempt at a Solution This...
  2. C

    Thevenin Equivalent issue - I think I'm missing something

    Homework Statement Given the circuit (Attached in image) Find the thevenin equivalent circuit. I know its a fairly simple thing, But I am not understanding where the lecturer is getting this answer from, unfortunately his solutions just state the voltage so I feel like I must be missing...
  3. A

    Thevenin equivalent phasor domain dependent voltage source

    Homework Statement determine thevenin equivalent of circuit at terminals (a,b): Homework Equations Z(L)=jwL Z(C)=-j/wC V(th)=V(oc) R(th)=V(ex)/I(ex) The Attempt at a Solution actually 1st i need help with finding V(th). i do know that V(th) would be the voltage across the 2ohm resistor, so...
  4. A

    Engineering Find thevenin circuit/ phasor domain

    Homework Statement obtain a thevenin equivalent circuit given that iS(t)=3cos(4x10^4)t A. to that end: a) transform the circuit to the phasor domain. b) apply source-transformation technique to obtain the thevenin equivalent circuit at terminals (a,b). c) transform the phasor-domain thevenin...
  5. N

    Engineering Help with intro circuit analysis problem Thevenin and max power prob

    Problem #1: What i did so far was I source transformed the left side with the Io and 4Ω into a voltage of 4Io. Then i did mesh analysis, io and i2. the eq'ns i got are 4vx - 2I2 - 2Io = 0 10i2 - vx - 2io = 0 IM not sure if this is right but does i2 = vx/4?? because of I = V/R? I worked...
  6. D

    Finding Thevenin Equiv for Circuit w/ R1, R2, R3, R4, R5

    Hi All, I am struggling to find the thevenin equivalent for the following circuit. I will leave out the values for the resistances because they don't really matter in this case. I'm looking for guidance on how to find the overall thevenin. I know the R-Thevenin is the same as the...
  7. K

    Finding Thevenin Equivalents using Source Transformations

    FIRST OFF: Sorry for the multiple post on this subject, I couldn't figure out how to edit my first post on this topic (I promise I'm not spamming!) Homework Statement Homework Equations The Attempt at a Solution Step 1: Removed unnecessary resistors R1 and R3. R1 is removed...
  8. A

    Engineering Find the thevenin equivalent circuit (just need my values checked )

    find the thevenin equivalent circuit (just need my values checked!) Homework Statement find the thevenin equivalent circuit (using open/short circuit method is how i did it): Homework Equations n/aThe Attempt at a Solution I just need to verify that my V(th)=V(oc) value is right: Vc/4 +...
  9. K

    What is the Thevenin equivalent for this circuit?

    Homework Statement https://www.circuitlab.com/editor/#?id=wt59bd Homework Equations ohms law The Attempt at a Solution Ok, from what I understand about this circuit, I can: eliminate R1 (resistors in parallel with a voltage source don't effect voltage), and eliminate R3...
  10. C

    Thevenin equivalent, (superposition?)

    Homework Statement http://imageshack.us/a/img14/2387/homeworktest2prob2.jpg a. Find the Thevenin equivalent circuit with respect to terminals a, B for the circuit. b. Find also the Norton equivalent circuit with respect to the terminals A, B, for the circuit Homework Equations V = IR...
  11. C

    Find the Thevenin resistance for network with dependent current source

    Homework Statement http://imageshack.us/a/img15/7218/sg2prob11.jpg Find the Thevenin resistance for the network(Sorry for the bad drawing, but that is a point like point / node A on the bottom where it's going out too and likely part of the load too, with a wire connected to the circuit, I'll...
  12. C

    Engineering Find the Thevenin equivalent circuit:

    Homework Statement http://imageshack.us/a/img809/9307/homeworkprobsg210omgthi.jpg Find the Thevenin equivalent circuit with respect to the terminals. Homework Equations V = IR, KVL, KCL voltage division, current division Thevenin formula / procedure The Attempt...
  13. joe_cool2

    Solve Thevenin Problem: A & B for R1 Circuit

    Homework Statement I give the entire question for context’s sake, but I am primarily concerned with A and B: Suppose you have the network shown below. We want the Thevenin equivalent for the part of the circuit that surrounds R1. A) Find Rth by zeroing sources and reducing the...
  14. L

    Find Thevenin equivalent circuit

    Homework Statement Find Thevenin equivalent circuit as seen across terminals A and B for each circuit. Homework Equations V=IR The Attempt at a Solution Those resistors are in parallel because not all of the current going through the top one is going to go through the next one...
  15. L

    Engineering Finding Thevenin Equivalent Circuit

    I'm given the circuit in the attached image (I just quickly re-created the circuit in LTSpice to save on drawing time). In the first part of the question I managed to find the S domain transfer function without any issue. I found the transfer function as some function of the resistors...
  16. J

    Thevenin equivalent for wheatstone bridge

    Hi, can anyone help me on how to find Thevenin equivalent resistances for a Wheatstone bridge configuration? I've searched all over google and youtube, but I haven't been able to fully understand the procedures.
  17. D

    Question about Thevenin Equivalent Vth

    Hi guys, I have a question that is nagging me quite a lot. Let us say that we have a circuit who has two independent sources (any combination of voltage and current sources). In the determination of Vth, can we choose whether or not to use superposition to find this Vth? Because my...
  18. U

    Can you me with this thevenin problem ?

    Can you please help me with this thevenin problem ? Please guys can you help me with this?? http://forum.allaboutcircuits.com/cache.php?url=http://s14.postimage.org/9eysbodr5/image.png I set all sources to 0 so we have Rth=3.667 KΩ then using superposition and remove the current source and...
  19. D

    Can the voltage thevenin be higher than VS?

    I am wondering if this is possible.
  20. L

    Norton and Thevenin equivalents disagreement?

    When I solve for Isc through a and b using Norton and Thevenin equivalents between c and d I get different results. Why is that? Norton =0.5mA Thevenin =2mA
  21. K

    Equivalent Voltage for Thevenin Equivalent Circuit

    Homework Statement This isn't for a class I'm actually taking. Just self study. I'm reading a book on electronics. When I got to the part about Thevenin's theorem I got a little confused. Specifically, I'm confused about the equivalent voltage for the Thevenin equivalent circuit. It said...
  22. N

    Engineering Thevenin Equivalent Circuit: using open/short circuit method

    Homework Statement http://i.imgur.com/fSRqw.png Homework Equations V_{th} = V_{oc} The Attempt at a Solution I got the thevenin voltage by using node voltage \frac{V2-40}{5} - \frac{80+2V2}{5} -8 + V2 = 0 (\frac{1}{5} + \frac{2}{5} + 1)V2 = 32 \frac{8}{5}V2 = 32 V2 =...
  23. U

    Finding the Thevenin resistance

    Homework Statement The circuit diagram is attached below. We're supposed to a) find the Thevenin equivalent circuit and b) find the value of Rl (the load resistor) so that the current flowing through it is 0.5A. Homework Equations The Attempt at a Solution Since the circuit...
  24. N

    Engineering Finding Thevenin equivalent circuit

    Homework Statement Find the Thevenin resistance. http://i.imgur.com/XoEfy.png Homework Equations Rth =Vex/IexThe Attempt at a Solution I found that the thevenin voltage is 869.304mV. I read in my textbook that in order to find the thevenin resistance in a circuit that contains a dependent...
  25. E

    Thevenin circuit Max power across Load resistor

    Homework Statement One Thevenin theorem result is that the maximum power across the load resistor in the equivalent circuit (and therefore the real circuit) occurs when RL = Rth. Start with the result that the power dissipated by the load resistor is I2RL and prove this result. Homework...
  26. N

    Thevenin Equivalent Explanation Request~

    Homework Statement http://img507.imageshack.us/img507/6493/f7868b61c6cb4d6084fa5ba.png Homework Equations The Attempt at a Solution I've tried to deduct how my textbook has actually done this Thevenin Equivalent. No one in my class (that I've come into contact with anyway)...
  27. J

    Engineering Thevenin Resistance complex circuit with dependent sources

    I am attempting to find Rth in the circuit attached however, I am totally lost. My work gets so messy and i seem to run around in circles. Can someone please explain to me how they would do this problem. Any help would be greatly appreciated
  28. G

    Maximum Power Transfer with Negative Thevenin Resistance?

    Hello everyone! I have a general question about how to find out the maximum power transfer to a load resistor with a negative Thevenin Resistance (Rth < 0). I know for positive cases, P = R*(Vth/(R + Rth))^2, in which R is the load resistor connected to the Thevenin equivalence circuit, and Pmax...
  29. B

    Finding the Thevenin Equivalent with a dependent source

    Hi! I'm having some difficulty understanding how to go about solving the following problem. I'm a beginner at this and am completely lost. I've seen a few similar problems that could be solved with node/current analysis, but I don't really understand if or how to apply that here. Can someone...
  30. E

    Engineering DC Circuit Analysis & Thevenin Problem

    Homework Statement Need to establish a Thevenin equivalent for the circuit attached. Homework Equations None given. Need to use Kirchhoff. The Attempt at a Solution I worked out the following: I said that R3 and R4 are in series as there is no current splitting because 0A...
  31. P

    Engineering Thevenin and Norton Equivalent Circuits

    Homework Statement Consider this circuit. Find the Thévenin and Norton Equivalent Circuits (just need the 1st one). Homework Equations The Attempt at a Solution My attempt: Can someone check? Thanks a lot!
  32. A

    Engineering Thevenin equivalent of a circuit

    Homework Statement I am attempting to solve problem number 4 from the following picture: http://img641.imageshack.us/img641/7950/imageisx.jpg In the picture you can see the suggested line of "cut" for the first application of Thevenin's theorem. The Attempt at a Solution I...
  33. D

    How Do You Calculate Power with Thevenin's Theorem and an Inserted Source?

    SOLVED... I DON'T KNOW HOW TO DELETE THE POST. Homework Statement Find the power delivered by a source (Is or Vs) connected between terminals a and b, after you've found the V and R Thevenin across those terminals. Homework Equations P=IV Is=given Vth=found Zth=found The problem hints that I...
  34. M

    Thevenin Equivalent with dependent sources

    Homework Statement See attached image Homework Equations Thevenin's theorem Node voltage method? The Attempt at a Solution So if I want the current Io, I believe I need to treat the 1K resistor as an open circuit in finding the Thevenin equivalent. I think setting ground to be the bottom...
  35. M

    Engineering Thevenin equivalent of an LED circuit

    Homework Statement How would I go about determining the Thevenin equivalent of a simple circuit involving a battery and an LED? I suppose there could be a series resistor to prevent excess draw and burning out of the diode. This question seems very odd since LEDs by definition don't...
  36. K

    Engineering Thevenin equivalent circuit with dependent current source

    Homework Statement Find the thevenin equivalent circuit of the circuit to the left of the terminals AB. Circuit diagram is attacted below. Homework Equations The Attempt at a Solution I know that the thevenin resistance is 1kohm. I also know that the thevenin voltage is the voltage across...
  37. J

    Electrical Engineering - Thevenin Equivalent

    Homework Statement (a) For the circuit above find the physical parameters of the Thevenin equivalent source with respect to terminals “a” and “b”. Assume that the resistances and reactances of the circuit are given at signal frequency 1 MHz. (b) Find the impedance of the matched load for that...
  38. E

    Working out Thevenin Equivalent

    Homework Statement Work out the Thevenin Equivalent of this circuit: https://www.physicsforums.com/attachment.php?attachmentid=46120&stc=1&d=1334164751 The Attempt at a Solution I worked out the Rth to be 300Ω, not sure if this is correct, and then I have no idea how to work out Vth Any...
  39. N

    Thevenin Resistance - Is this a mistake in the book?

    Homework Statement http://img818.imageshack.us/img818/4065/thvs.jpg The Attempt at a Solution Calculating the Thevenin Resistance there I get 16Ω - the book however says it's 3Ω. The way I see 3Ω being calculated is if 4Ω were in parallel with 6Ω + 6Ω - however they all appear to be in...
  40. E

    How Do You Solve Problems Using Thevenin and Norton Equivalents?

    Hi, i need help on this question. Anyone can show me a step by step method. Thx.
  41. E

    Finding the thevenin equivalent using Vo and Io

    Hey, I'm trying to find the thevenin equivalent of a particular circuit so that I can calculate the current across an inductor. I've attached a pdf with the circuit and the working out I've done so far. When I'm talking about i0 I'm talking about the Thevenin equivalent current and...
  42. A

    Voltage-current equation of Thevenin circuit

    Homework Statement I need help with part (b). Homework Equations The Attempt at a Solution The Thevenin resistance is 15 ohms, voltage open circuit 30 V and the short current circuit is 2 A. You can take these for granted, I've confirmed with a friend. I really don't know what...
  43. N

    Solving Thevenin Circuit with R1 Removed: Explanation and Calculations

    pic aint working, going to upload it again. If you just copy & paste the URL it works fine http://cottage7.angelfire.com/Thevenin.png I've been using this site for a while but I finally have a problem that I could not relate to another on this site so here I am! Homework Statement I...
  44. C

    Thevenin and Norton Theories help

    the problem presents a wheatstone bridge design, with a 10 V DC power supply. R1 is 2 ohms, R2 is 3, Rx (presented as R4 for this problem) is 4, the typical 'bridge' portion is replaced with a 1 ohm resistor (labeled R3), and where you usually have R3 you have a load, which is 5 ohms. The...
  45. D

    Thevenin equivalent for strain gauge bridge

    A strain-gauge bridge is made up of four resistive elements, each element having an unstrained resistance equal to R, as shown in the diagram below. When a strain is applied to the bridge elements R2 and R4 increase in resistance by an amount ΔR, whereas R1 and R3 decrease by ΔR, where...
  46. F

    Engineering Thevenin equivalent circuit help

    http://img855.imageshack.us/img855/5369/eehmwk.jpg [b] I haven't done this before with 2 voltage sources so I'm not sure how I would go about doing it. If someone could show me step by step how to understand this, I would appreciate it. Equivalent resistance = 2.5ohms, right? But...
  47. T

    Thevenin equivalanet and max power question

    could you check this question if i am doing it right? http://vyew.com/844710/circuit_analysis_examples
  48. B

    A bit of trouble with Thevenin equivalence with dependent sources

    This really isn't one specific problem per se as it is more of a conceptual issue, so I apologize for breaking away from the given format. I've worked through three problems involving a circuit where a thevenin equivalence circuit is required between two points, and all sources are dependent...
  49. E

    Thevenin equivalent with dependet sources

    Homework Statement Hello, i was studying diodes for my exam on monday, but i had some struggle finding the Thevenin equivalent. Here is the circuit: http://img411.imageshack.us/img411/5336/schakeling.png Homework Equations I have no clue what to put here? The Attempt at a...
  50. M

    Engineering What is the Thevenin equivalent circuit for a circuit with a current source?

    Here the attachment is the question. I have some experience in solving Thevenin with Voltage source, but not with current source. Any idea? thanks and regards, May
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