# Questions tagged [thevenin]

Thévenin's theorem for linear electrical networks to simplify the analysis of complex electrical circuits.

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### Calculation of equivalent resistance

I need to calculate the equivalent resistor between knots A and B to then use it in Thevenin Generator; it says the result should be (R // Zl) + (R // R) however I don't quite get why that's the case.
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### How do you find the RTH of this?

I suddenly got confused while practice solving using Thevenin method.
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### Find Thevenin's voltage

How could I find Thevenin's voltage in this circuit? I can't use KVL since i don't know the voltage rise of the current source after removing the load.
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### Is it wrong to use Thevenins theorem on this memory circuit?

In my electricals beginner class I was given a paper about memory circuits. There was a small section about how writing data to a single memory cell worked. Here is the sketch of the memory cell: My ...
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### Node equations for Thevenin voltage

I have the following circuit as shown in the picture below: I am interested only on finding the $V_{th}$ and not the Norton current. I choose to work with node analysis because I find it easier. In ...
1 vote
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### Getting differing theoretical and simulated values of V{thevenin's} on LTSPICE

I got this question to find the thevenin's voltage across the load resistor RL when R = 5 ohm. I made the schematic circuit in LTSPICE and performed a DC op simulation on the circuit and got the value ...
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### Should resistance between a and b terminals be considered when computing Thévenin-equivalent resistance?

When attempting to find the Thévenin-equivalent circuit to the left of terminals a and b in the image below, should one consider the 4.7 kΩ resistor? Why or why not? When taking the 4.7 kΩ resistor ...
1 vote
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### DC Thevenin voltage

The question I am trying to answer is: Find the Thevenin voltage Vth to the left of the 10-ohm resistor. I have determined Rth for the electrical circuit in the pictures (Rth = 5 ohms) but I am ...
1 vote
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### Need help finding the thevenin voltage across the diode. Is my work correct?

I am admittedly really poorly versed in Thevenin's theorem and this is giving me a lot of trouble. I am having a hard time visualizing how to approach the problem, so any help would be appreciated.
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### Thevenin Equivalent of a common emitter amplifier

Consider a CE (Common Emitter) Amplifier without the emitter capacity. After having determined the operating point we pass on to the small-signal analysis. It doesn't matter what model we use (...
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### Thevenin's Theorem: Finding Rth with Dependent Source

I was working on the problem below (which I was supposed to find Vo using Thevenin's Theorem) and tried to find R_TH but got the wrong answer. The issue is that there is a dependent current source, so ...
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### Thevenin/voltage logic

So, I'm trying to find the Thévenin voltage of this circuit. I understand that the resistors (R+3R) by node a are irrelevant as there's no current running and thus no voltage drop. However, I'm a bit ...
1 vote
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### How to derive the maximum power transfer theorem using the relation p=v²/R?

In most derivations of the Maximum power transfer theorem the derivation is done using the relation of power : P = i²R And on further derivation it comes out to be Pmax = Vth²/4Rth If I derive the ...
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1 vote
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### Performing Node analysis with more

Following a previous question problem regarding the node analysis with dependent source in a circuit I made some extensions that I would appreciate some validation if someone know. I have the ...
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### How can I perform Node Analysis with dependent source?

I have the following circuit as shown in the picture. My question is how can I perform Node analysis in this circuit in the node $V_{0}$? I want to find $i_{1}$ but without KCL or KVL. Just the ...
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### Finding the Thévenin and Norton equivalents for a circuit

I want to find the Thévenin and Norton equivalents for the circuit below. However I'm new to this and I would really appreciate some help. I start with a source transformation and naming all the ...
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### Different results when using nodal and mesh analysis; application on a Thevenin equivalent problem [closed]

I need to find the Thevenin equivalent of the given circuit. The problem is that when I use Nodal analysis and mesh analysis I get different results. I know that Rth = 16 Ω. But when I use nodal ...
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### KVL/KCL and Thevenin Concept [closed]

I have solved the following question but little bit confused that this solution is correct or not as attached in figure. How can I solve this question by KCL/KVL also if by using Thevinin theorem its ...
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### Thevenin equivalent- what did my professor do

I have to find the Thévenin equivalent of this circuit. The point of interest here is 4. I reduced it down and got the same resistance value as my professor, but I still had the original 10V as my ...
1 vote
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### Thevenin impedance problem

I've tried to find the Thevenin impedance of this configuration but I keep getting wrong answers. My idea was to look at it as a double delta configuration, convert the upper delta to on y and carry ...
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### Thevenin's Equivalent using KCL - Circuit Analysis

I've been struggling for so long on this practice question for circuit analysis. Am new to this topic so would really appreciate some guidance! :) The question is as follows: With the load Rl removed, ...
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### Thevenin equivalent mesh equations

I came across to this problem that deals with Thevenin equivalent in a first order circuit.But for now forget the first order. My problem is how the mesh analysis equations came to this initial ...
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### How can I maximize the power consumed in this resistor?

simulate this circuit – Schematic created using CircuitLab I have gotten really stuck on this question. The question is: Determine R3 so that maximum power is consumed in R3. What is that ...
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### Limitation of the Thevenin's equivalent circuit

simulate this circuit – Schematic created using CircuitLab Thevenin's theorem independently derived in 1853 by the German scientist Hermann von Helmholtz and in 1883 by Léon Charles Thévenin (...
1 vote
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### Possible Explanations for Unexpected Results: Negative Resistance and Consistent Short-Circuit Current and Open-Circuit Voltage

My objective in this circuit is to find the value of RL that achieves maximum power transfer. simulate this circuit – Schematic created using CircuitLab To do this, find Voc and Isc, as shown ...
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### How can I find the Thevenin's Equivalent on this problem using Superposition Theorem?

I am reading Foundations of Analog and Digital Electronic Circuits from Anant Agarwal. In chapter 3 there is the exercise 3.11 at the end of the chapter that states : Find the Norton equivalent at the ...
1 vote
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### Thevenin Equivalent with Superposition Theorem

I have the following circuit that I found (here) https://www.tutorialspoint.com/network_theory/network_theory_thevenins_theorem.htm The author uses the node analysis in order to calculate the Thevenin ...
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### First order circuit with Thevenin equivalent

I am self reading linear electrical circuits and I came across to a problem that I don't know how to approach it. The problem states :"In the following circuit with dependent current source, find ...
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### How do I find the Thevenin Voltage?

I have this problem that I need to study up for my electronics reexam. I do not know how I got the Vc/5 , probably from a YT guide I saw at that time. Please help me if you can, because I cannot ...
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### Thevenin and Norton Problem

I have been trying to solve this circuit for an hour. I am doing something wrong, could you please verify my step i am not sure what i did wrong. VOc/Isc should be 0.51 ohms and Vo should be -2.72 V.
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### Thevenin equivalent circuit of dependent sources

I'm trying to figure out the thevenin equivalent circuit of this There's a hint to use a voltage test, which I did. I know the Vth = 0 since there are no independent sources in the circuit. But I don'...
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### Why is Thevenin Voltage of this circuit equal to the voltage source?

I am well aware that Thevenin voltage is equal to the open circuit voltage at the end of the circuit. The circuit information are: $𝐕_𝐴$=50∠0 V, $𝐈_𝐵$=5∠0 A, $𝑅_1$=10 Ω, $𝑅_2=10$ Ω, and ...
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### How can I find the Thevenin Equivalent in a RC circuit with dependent current source?

In the picture below, at time $t=0$ the switch closes and the voltage of the capacitor is 10 volt. I am asked to find the Thevenin equivalent right from A,B terminals.But there is a dependent current ...
1 vote
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### Help for RL step response

Here is the question I am trying to solve: I didn't find Vo(t). What way should I go to find this value? ( Vo(t) is a voltage on 40k resistance after switch moves b.) Here is my attempt: ( It looks ...
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### Need help to find Thevenin resistance and Thevenin voltage

Here is the question I am trying to solve(there are 2 things I need to find. These are Vth and Rth): Here is my attempt: ( please check Vth if it is true ) I couldn't find Thevenin resistance at all ...
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### Sign convention to use in Nodal Analysis

simulate this circuit – Schematic created using CircuitLab We know that current flows from higher potential to lower potential in a resistor. In this question, we make use of nodal analysis and ...
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### Thevenin's resistance with a dependant source

I have this circuit for which we must find the Thevenin resistance in considering the load is $R_L$. For this case I calculated $E_{th}=-\beta i_b R_4$ by shorting the load resistor $R_L$ so the ...
1 vote
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### How can I solve this Thevenin equivalent problem?

I came across an exercise in Linear Electrical Circuits that says: Find the Thevenin equivalent in the terminals A,B as shown in the picture below. Regarding the R_{Th} = 6||4 = \frac{6*4}{6+4}=\...
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### Dependent current sources in Thevenin equivalent

In this question to find out ZTH, why have we put a 1 A current source? Can't we just short circuit the VTH potential and find the current across that to find ZTH? Source: https://i.stack.imgur.com/...
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### Efficiency of maximum power transfer

I’ve got this question regarding maximum power transfer. I’m trying to find the efficiency of the circuit by dividing power absorbed over power supplied. I think I found power absorbed (PL) by using ...
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### Why can't we use resistance formulae in Thévenin's theorem, when a dependent source is connected?

According to my textbook, if a dependent source is connected to the circuit (while calculating Thévenin's equivalent resistance), we can't use the series and parallel connections formulae for ...
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### Why are resistors that are shorted and connected to each other considered to be in parallel and not in series?

In the following image, we are finding the Thévenin equivalent resistance after shorting the voltage sources. Why are these two resistors considered to be in parallel? It seems they are connected both ...