Questions tagged [thevenin]

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

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Thevenin Equivalent Circuit of Ideal Independent Current Source

This is dual to <Norton Equivalent Circuit of Ideal Independent Voltage Source>. I have wrote it to answer a problem <click here> but I need to make it independent which requires ...
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Norton Equivalent Circuit of Ideal Independent Voltage source

For some purpose I need to derive the equivalent Norton circuit of an ideal independent voltage source. I found that it is impossible to do it. I describe the way I found it below and need comments, ...
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Applying Thevenin's theorem between 3 points

I'm studying about transistor polarisation and got confused by this application of Thevenin's theorem, can someone please explain why eT is between B and M and why Vcc stayed even though it's not ...
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How to choose nodes for Thevenin equivalent circuit

I would like to know how do we choose the nodes for a Thevenin Equivalent Circuit. For example, in the voltage divider, we compute the Thevenin equivalent circuit between the nodes where we would ...
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BJT voltage divider biasing and thevenin equivalent

I am studying BJTs and I came across this configuration. My book applies Thévenin equivalent to the base and I do not understand how it does that, it does not make sense as there is base current to ...
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Help With Thevenin Resistance Problem

Ok so I'm really new to electrical engineering and I was wondering if someone could help me analyze this circuit using KVL and KCL node analysis. I'm not really sure as to how I can set the KVL and ...
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Hallar V0 de la siguiente figura [closed]

a. 1.058 + j2.235 b. 3.835 < -35.02 c. 34.69 + j6.93 d. 6.154 <70.26
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How to solve the question shown in figure ?I tried to solved it by Thevenin equivalent but i am not able to find Voc

I find Req that comes out 0.75 but i am stuck in finding Voc. I tried it with nodal analysis in frequency domain but still not able to get answer.
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Using Multisim to Measure Thevenin Resistance

Using probes, it is easy to find the Thevenin voltage, and Norton Current of a circuit. We could simply divide Vth / In = Rth, but is there a way to find Rth through a simulation?
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op-amp thevenin resistance calculation in pspice

hi everyone so my question is how do i calculate the equivalent we see from Vo node (output of op-amp) in pspice beacause anything i do i get 0 value it will be appriciated if one of you help me to do ...
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Thevenin Equivalent of circuit

I have a circuit that looks like the following. It appears to be simple- What's the thevenin equivalent? I can't seem to simplify it as there are no common nodes that any of the resistors connect.
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How Do You find The Cutoff Frequency of a Low Pass Filter?

A lowpass filter exists around R1,R2,R3 and C2 but how would you find the cutoff frequency? I think that you have to first find the Thevenin equivalent circuit and this is what i got: RTH = (R1//R3)//...
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What circuit element must be removed to have the VTh equal to the voltage between two points using Thevenin's Theorem?

The question that I'm trying to understand is provided below: The Thevenin's equivalent of the circuit "around" 6 ohms has a VTh equal to the voltage between a & b, (a) With the 6 ohms ...
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How to Find Thevenin's Voltage & Resistance?

I've a hard time understanding Thevenin's theorem. I know that it is just a theorem to simplify a complex circuit, and to easily analyse that. My hard understanding is in the mathematics of it. Given ...
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Thevenin's theorem

So I watched a couple videos on Youtube about Thevenin's theorem and I found 2 ways to do this circuit,but I get two different answers and I'm confused now.(for finding \$V_{th}\$) First method is \...
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Replace everything in the circuit except the 3 A source by its Thevenin equivalent circuit and use the result to find V1

Replace everything in the circuit except the 3 A source by its Thevenin equivalent circuit and use the result to find V1. This is my solution but the teacher said it is wrong and i do not know how to ...
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Can anyone solve this diode circuit with Thevenin theorem, please?

The question says: Assuming that the diodes in the circuits of Fig. are ideal, utilize Thevenin's theorem to simplify the circuits and thus find the values of labeled currents and voltages. Update:...
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How to find total voltage in a two loop circuit

I've been going through the DC Theory textbook by NJATC to learn basic electronics so I can better enjoy my guitar tinkering. But I also want to be able to repair or maybe even build effect pedals and ...
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Why is the verification of Thevenin's theorem more accurate than that of Superposition theorem?

In my first course on Electrical Engineering, we have an experiment in the Electrical lab that asks us to verify the Thevenin theorem and the Superposition theorem and cross-check our results with our ...
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Thevenin equivalent and maximum power transfer theorem question

I want to find a load resistance's value so that it gets the maximum power transfer, and thus I am using Thevenin's theorem by finding the equivalent circuit's resistance. By doing so, I got 2929.28 ...
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Simplifying circuit for Thevenin's theorem

I am supposed to find a Thevenin's equivalent circuit for this one: I am struggling with simplifying it to calculate Rth. When I apply short circuit to voltage source I achieve a junction connected ...
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LTSPICE Thvenin voltage

How can I read Thevenin voltage from such circuit in LTSPICE? I know how to get Thevenin resistance in LTSPICE. I calculated manually values that I expect to get from LTSPICE and indeed Thevenin ...
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How to convert to polar form?

I'm still stuck on this task: And I'm trying to calculate Vth. I've calculated: And the Vth equation is: My problem now is that I want to convert from rectangular form to polar form for 100j/...
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Is the Kirchhoff's Current Law correct?

I'm on this problem: And I'm trying to use KCL to find Vth, my approach is: Am I on the right path regarding KCL? Thanks in advance!
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Simplifying a circuit using Thevenin

I need to find the Thevenin Resistance between A and B, I have the circuit shown below. My question here is: are R2 and R3 in series as well as R4 and R5? If so, can I then by grouping them ...
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Thevenin Nodal analysis

Anyone has any idea how to deal with this tricky circuit using Thevenin?
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How to use Thevenin's theorem in a circuit with more than one source?

Attempts thus far at the solution:
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Thevenin Resistance query

I have an amplifier model circuit where I've determined the load (speaker) voltage (using its peak power output and its resistance) and measured the open-circuit voltage. How can I work out the ...
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Thevenin tension on the following circuit

I've been trying to solve a circuit by aplying thevening (the following one) I've obtained 11,4V but I've seen to be wrong. Can anybody help me?
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Why will i calculate the wrong current when i transform part of circuit to Thevenin circuit?

Here is the circuit in this question The original circuit is in the left hand side,as we can see,there are two norton circuits in it,so i transform them to the thevenin equivalent circuit,just like ...
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Find the Thevenin's equivalent of a circuit between nodes A and B

My class had come to discuss the Thevenin's theorem and we stumbled upon this particular problem which quite confuses me in a way that what I found is different than what my lecturer taught us. So, ...
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Can anyone tell me why can the author just write the formula of Thevenin equivalent voltage of this circuit?

How to find the thevenin equivalent resistance and voltage? simulate this circuit – Schematic created using CircuitLab The solution for calculating the thevenin resistance is \$(5//20)+2+1+2=...
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Thevenin Equivalence Problem

So I have this question that I'm struggling to understand and solve, it goes like this: I want to determine the Thevenin equivalent of my car battery. You measure a voltage of 12.2V across the ...
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Circuit analysis Thevenin example in sinusoidal steady-state with dependent and independent ac sources

So I get really confused when I see a dependent source (and serial?) in thevenin-norton problems. Can you help me with these questions? (I think in the question of the figure b the value C is ...
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Finding the Thévenin Equivalent without seeing circuit?

So I have this task: Per-Erik connected a load resistor RL to a battery rated to be 9V. He measured the voltage (VL) over the load resistor for different values of RL. The measured data is shown in ...
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Idea behind Thevenin equivalent circuit

As i know, we find a thevenin equivalent resistance by finding open-circuit voltage and short-circuit current and then divide these two. I have looked on wikipedia and other sources but could not find ...
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Apply Thévenin equiv. on this diode problem?

I'm wondering if I'm thinking right when wanting to use the Thévenin equiv. on this diode problem? I'm thinking that in order for me to calculate \$I_D\$ then I have to "open circuit" the diode? Am I ...
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Thévenin with dependent source and unknowns?

I have this problem where I need to find the Thévenin resistance. However I have a bit of a trouble of thinking how I should do it with a dependent source and that everything is unknown. How should I ...
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Circuit with dependent & independent voltage sources - Why not matching?

I've just solved this exercise by hand and then I have compared the results with PSIM Simulator and there's a difference of e-006 in the Voltage Vo. I just can't understand where's the mistake, I have ...
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How to calculate maximum power when value of load resistance is unknown?

Once again same circuit and same voltage source / current source and resistances. However now I need to calculate the maximum power that is consumed by the RL. How do I do that, and most importantly ...
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How do I calculate load resistance?

I'm here with yet another problem. This time I can't figure out what the question wants. I've calculated the Thévenin equivalent, however I can't work out how I should calculate the RL. Is the load ...
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Voltage divider bjt biasing with thevenin theorem

Say I have this circuit: I am confused as to how using Thevenin's theorem yields correct results. Say I choose a bias point on an I-V characteristic curve at the IC = 16mA. If this transistor has a ...
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Getting thevenin equivalent when there's a current source only

I am stuck in finding the V-thevenin in this circuit. So what i did first is removed the current source and replaced it with an open circuit. After that i got the Resistance thevenin which is the ...
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How do I apply Thevenin theorem in this problem?

Can't find the answer to this question. Am I supposed to get the voltage in the 4 kilo ohm resistor? Really appreciate it if anyone can solve this one! Here's the circuit:
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Using Thévenin's Theorem / Voltage Across Independent Current Sources

I've been attempting this problem regarding the usage of Thévenin's Theorem to find the value of Io. I am able to get the correct Thevenin Resistance, however attempting to find the Thevenin Voltage ...
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How can the maximum average power transfer be negative in a power delivery circuit?

It is possible that the Thevenin resistance \$R_{Th}\$ of a circuit is negative. This occurs in non-linear circuits. Likewise, in AC circuits, the real part of \$Z_{Th}\$ can be negative. For AC ...
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Equivalent Thevenin voltage of a circuit with three capacitors in parallel

In the circuit above, I think the Thevenin voltage across terminals a-b should be equal to 22.5 V since the voltage divides equally across the 5F capacitor and the 2F and 3F capacitors which have a ...
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Using a Cap as V_th in Thevenin Equivalent Circuit With Natural Response

My instructor solved this problem by creating a thevenin equivalent circuit to the right of the capacitor. But what I find odd is how at the end of it, there does not appear to be a thevenin voltage ...
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Redrawing a wye circuit

Instead of using wye delta transformation I tried redrawing the following circuit but I do not understand where I made a mistake. The circuit appears to have the same voltage current relationships at ...
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Circuit interpretation with a short circuit

In the following circuit, which has a short circuit between terminals a and b, I do not understand why the resistors are not all in series. For them to be in series the same current must flow through ...

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