Thevenin Definition and 318 Threads

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...

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?

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...

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...

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...

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 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...

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)...

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

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...

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...

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°)...

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...

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...

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...

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

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...

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...

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 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...

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...

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?

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

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.

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

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...

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...

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 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...

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...

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...

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

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...

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 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...

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 =...

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...

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 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...