Thevenin Definition and 313 Threads

Homework Statement Compute the values of the Thévenin equivalent seen by the 20 kΩ resistor using circuit analysis techniques. Draw the equivalent circuit and list the values. Homework Equations V=IR Nodal analysis mesh analysis The Attempt at a Solution I know a Thévenin...

Homework Statement I wish to obtain the Thevenin equivalent for the network show in the attachment between the terminals a and b. 2. The attempt at a solution First I considered the voltage source alone (replaced current source by an open circuit). I = \frac{V}{Z_T} =...

Homework Statement Find the open circuit voltage across A & B: Homework Equations V = IR The Attempt at a Solution If I0 is the current leaving the voltage source and passing through the first resistor, I1 is the current through the left resistor in parallel, and I2 through...

Hey I can't figure out how to convert the below circuit into its thevenin equivalent. I am used to having two points to work with, but in this circuit there is only one and a ground. http://img715.yfrog.com/i/13332492.jpg/ for some reason the image doesn't show up on my screen; if that's the...

Homework Statement ^We're asked to find the "Thevenin's equivalent circuit for the source" The Attempt at a Solution I'm a bit unsure how to start this problem. What i initially thought was that i'd combine all my impedances in parallel to the point where it's them combined plus the...

Homework Statement Find thevenin equivelent of this circuit with respect to a and b Homework Equations Mesh Currents The Attempt at a Solution Here I will try to find V(open circuit) = Vth = Vab ((I think this anyways)) I apply mesh currents (any faster methods are welcome if...

Homework Statement Hi there, I got this question from an old test. I would say I have limited knowledge of electronics and would ask for guidance into what approach to take with this question. Homework Equations The Attempt at a Solution No attempt yet. I thought of breaking it...

Homework Statement V1 = 15 V V2 = 4 V I = 2 A R1 = 3 Ohm R2 = 4 Ohm R3 = 8 Ohm R = 2 Ohm In this part of the question, I have to solve for the voltage across a and b R isn't listed as a resistor in this circuit because that comes in a later part of the question (which I can do). Homework...

Hi, this isn't homework, just a practice problem (for which the solution is given)I found online that I am trying to prepare for my midterm next week: My question is why can't I simple solve for is using the left loop. So 5V-500is-400(6ma)=0, which gives is=5.2ma...alternatively I didn't...

Homework Statement I am being asked to draw the Thevenin equivalent for and to calculate the voltage that would appear across RL if it were connected across the 2 output terminals. Using Kirchoff's law I found that the voltage across RL is -12.5 V. However I am really suppose to do it using...

Homework Statement The circuit is attached as a jpg image. How can i find the norton equivalent when both current sources and voltage sources are present? please help Homework Equations The Attempt at a Solution

Homework Statement http://img444.imageshack.us/img444/5601/scan0001my.th.jpg Hey, I'm trying to solve this problem using thevenin's method. As you can see in method 1 I was able to solve for the correct output voltage of 7.5 volts. When I try Thevenin's method I get 4 volts. I have a...

Homework Statement Homework Equations Thevenin stuff, right? The Attempt at a Solution So, I tried to re-write everything and make it a bit easier to understand: I ended up getting Rth completely fine and everything, but I can't seem to get Eth. So from there, I...

Homework Statement Find the Thevenin equivalent at terminals A-B of the circuit below. http://img5.imageshack.us/img5/1723/thevenin.jpg Homework Equations The Attempt at a Solution

On the first image i have to find the thevenin equivalent viewed from terminals x, x' & y, y' i get the Req as 7.32ohms but now i am having trouble calculating the vth, i have no I to calculate thanks in advance

Homework Statement Calculate the Thevenin voltage Vt and the Thevenin resistance Rt. Homework Equations V=(Vt*R)/(Rt+R) I=Vt/(Rt+R) The Attempt at a Solution I'm thinkin that my R is 1 ohm but I can't figure out how to simply the rest of the resistors to get Rt. If I can get...

Homework Statement For the linear circuit shown, given that the current I in the 0.9 K\Omega is 10mA when Vs = 100V: (a) Predict I using the proportionality property for: Vs = 25V, -12V, and 145 V respectively. (b) Use Thevenin’s theorem across terminals a and b. Find I in terms of Vs and...

Not sure if I am using the right technique or even using the technique correctly... http://img8.imageshack.us/img8/6346/practiceprob.th.jpg http://img44.imageshack.us/img44/8479/workedpracticeprob.th.jpg

Homework Statement When finding the Thevenin resistance for a circuit, there is a method involving applying either a test voltage source or a test current source at the terminals a and b. My teacher didn't really go into this in very much detail so I was wondering if you can specify any value...

Homework Statement Finding the Thevenin and Norton equivalent circuit The Attempt at a Solution Just wondering whether i have done it right? So the Thevenin circuit has a voltage supply of 12V, in series with an 8 Ohm resistor, while the Norton circuit has a current supply of 1.5A in...

Homework Statement Find the Thevenin Equivalent resistance for the network below: http://img27.imageshack.us/img27/8508/circuit.png Homework Equations R=(1/R1+1/R2)^-1 The Attempt at a Solution Hi all, to find the resistance i short circuited the volage sources and...

Hi, I found this question from a textbook: Suppose there are two black boxes, Box A has a 1V voltage source and 1ohm resistance (Thevein Circuit); and Box B has a 1A current source and 1ohm resistance (Norton Circuit). You only have access to the two terminals. How do you know which is which...

Homework Statement For the circuit shown: Find the Thev Eq between nodes A and B and then for nodes C and D. I worked the second half of the equation but am stuck on how to begin the analysis for the opposite end of the circuit. I have attatched the image as well as posting it as I am having...

Homework Statement I am trying to find the theoretical Thevenin equivalent resistance for a black box that I used in an experiment. The measured Thevenin equivalent resistance was roughly 4786\Omega. However, I have tried several times to solve the problem, but keep arriving at a theoretical...

Homework Statement Find the Thev Eq circuit for a DC power supply that has a 30-volt terminal voltage when delivering 400mA and a 27-volt terminal voltage when delivering 600mA. Homework Equations KVL: Vs=IsR1+IsR2 Vth=Isc*Rth The Attempt at a Solution Assuming that each 3volt...

Homework Statement A car battery has an open-circuit terminal voltage of 12.6 volts. The voltage drops to 10.8 volts when the battery supplies 240 amps to the car's starter motor. What is the Thevenin eq for this battery? Homework Equations I think the root of my problem is the setup of...

I'm having trouble with Thevenin models, specifically this question where the V_oc is not given. The problem: Assume an unknown circuit provides the specified current through the load resistors as given below: 100k - 2.3mA 1.2M - 510uA Find a Thevenin model for the unknown circuit. All...

Homework Statement I want to find Rτ (Thevenin Equal Resistance) if the load is R4 in the attached image's circuit. As easy it may seem, I get confused because it asks for the equal resistance between A and B. Homework Equations The Attempt at a Solution We remove the voltage sources and...

Hi! Good day! I was studying Circuit Theorems when I stumbled upon this circuit that has a dependent current source asking for a Thevenin equivalent. Up until now, I was only familiar with solving circuits with independent sources so this has me having a hard time. I tried using...

Homework Statement hey guys. I am new to the board. I've seen this problem on a website of which i'll list below. I am not sure how came up with that formula for e. http://hyperphysics.phy-astr.gsu.edu/HBASE/electric/thevenin.html -> is the link to the page. i understand the rest of...

I have to find the thevenin equivalent of the following circuit in order to find the current and potential difference across the 6 ohm resistor. I can not get to know that where should I start. Should I divide the circuit into 2 parts or what? http://img141.imageshack.us/img141/2690/416qr1.th.jpg

I start with the Thevenin equivalent. \hat{R} = R_2 + R_4 || R_1 = 6 \Omega R_{Th} = R_3 + \hat{R} || R_5 = 8 \Omega The correct answer here should be 2 \Omega

Finding the thevenin equivalent of the above circuit This is what I did, I set the current source to zero, no current passes through so the Rth is the resistor on farthest right // with another 2 in series with 4. so it is 5ohms? Finding the open circuit voltage, I use a current...

I don't know which node to take as zero voltage. Either C or B or both. Finding Out I-V characteristic of +V-. Considering Vb = 0. ASSUMING V IS SOME LOAD I = I2 - I3 I = ((Va - Vd)/10) - ((Vc - Vb)/10) I = ((7 - 5)/10) - ((Vc - 0)/10) I = 0.2 - Vc/10 Where Vc - Vb = V Considered Vb = 0 So Vc...

Hi All, My name is Joaquim and I'm new in this forums. I am a Electronic Engineer student (1st Year). I have a question about a Thevenin equivalent circuit in AC. I need someone to tell me if I'm doing the right math in finding the thevenin equivalent (AB point): Please see the...

Homework Statement Ok, i don't understand how they calculate the voltage. how are they getting the Vx? How do i read the circuit to know when to subtract, and add voltages? Also for Voc why do they add them together ? \

So to find Rth why did they choose these resistors. After choosing those resistors to find Rth , then i must use those resistors and go in a loop to find Voc ?

I trying to figure out a thevenin equivalent circuit I want to calculate the current I so I can't get the resistance for the thevenin equivalent. Im not 100% sure how to calculate I, can I use KCL on the node under the number -8.7V? http://img98.imageshack.us/my.php?image=curfc7.jpg

Homework Statement I really don't see how the Thevenin equivalent circuit is obtained from the one on the left. The way learned to find Thevenin equivalent circuit considers the circuit network in between 2 nodes. This one appears to have 3 nodes. And why is the thevenin resistance given as...

Homework Statement you have a phototransistor that you have modeled as a Thevenin equivalent circuit. It has a output impedence(Thevenin Impedence) of 10kohm and produces a peak voltage o2 2V at a frequency of 80 MHz. The input impedence of the oscilloscope as this simple combination of input...

Never mind, did superposition incorrectly. Homework Statement http://img258.imageshack.us/img258/9206/jesus2gn2.th.png Find Vload using superposition and thevenin's equivalent Homework Equations The Attempt at a Solution Well for network on the left of Rload, I found Vth...

Hello, I am working on the following problem: http://img155.imageshack.us/img155/2478/thevpo9.jpg I am stuck on this seemingly simple circuit problem. I've worked many Thevenin circuit problems in my introductory circuit analysis. This problem is from a new class and seems different...

Homework Statement Basically asking me to find the Thevenin/Norton's equivalent across a-b. Then figure out the maximum power transferred Then figure out max power delivered Homework Equations Maximum power is transferred when [SIZE="5"]R_{l} = R_{th} . Max power delivered is...

Can someone help me detemine The thevenin Voltage, the thevenin resistance and the Norton current of this circuit I can't solve it cause it has two current sources I have uploaded the picture Thank you

i've got a problem about the thevenin and Nortn models applications. i've been given a table giving 3 outpout voltages(v1= 200v,v2= 150V,v3 = 100v) from the voltage sources with their corresponding current(I1= 0A,I2= 12A,I3=22A). The question was to draw a V-I diagram and draw the...

Homework Statement Find the Thevenin equivalent of the circuit shown below Homework Equations Nothing but basic principlesThe Attempt at a Solution Alright, I realize that it will take some time for the attachement to be approved, but it's a really simple circuit. It has just one loop...

What is the most general method that can be used to get the Thevenin equivalent for a circuit (one that always works)?

Homework Statement There is a non-inverting op-amp below. http://img291.imageshack.us/img291/8242/chapter5lastproblemea1.jpg The op-amp is NOT ideal. We assume that R_i\,=\,\infty, R_0\,>\,0 and A is finite. Find the general Thevenin equivalent circuit seen at the terminals...

Homework Statement Find the Thevenin equivalent at terminals a-b in the circuit below. http://img361.imageshack.us/img361/2250/chapter5problem36gq0.jpg Homework Equations KVL, KCL, v = i R, current and voltage equations for Operation Amplifier The Attempt at a Solution So I altered the...

Homework Statement Find the Thevenin equivalent at terminals a-b for the transistor model below. http://img254.imageshack.us/img254/7228/chapter4problem52bj6.jpg Homework Equations KVL, KCL, v = i R, R_{TH}\,=\,\frac{V_0}{I_0}The Attempt at a Solution I took out the independent voltage...