Thevenin equivalent Definition and 160 Threads

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...

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...

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

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)...

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...

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...

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

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...

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...

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...

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

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...

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...

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...

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...

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.

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...

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...

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?

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...

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...

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...

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_{...

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...

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...

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...

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...

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 =...

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...

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...

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...

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 +...

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...

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...

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...

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...

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...

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.

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...

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...

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 =...

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...

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)...

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...

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...

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...

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...

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...

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...

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...