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Questions tagged [thevenin]

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

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34 views

How to get power in dependent voltage source?

l've made a simple circuit using Thevenin's theorem, and then help me which node to formulate to solve the problem. (I've written Thevenin's theorem, am I writing it correctly?) Also, Vx is a ...
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How to solve circuit using superposition, thevenin, norton… etc

I want to solve this question, but i am beginner at circuit... So i don't understand when I have to use superposition, thevenin, norton.... because those are so confused..... (i am so sad...) Maybe ...
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Finding Voltage Thevenin via short circuit

I found this question online where \$ R_1 = R_2 = R_3 = R_4 = 15 \Omega \$ and \$V_s = 15 V\$ Finding \$R_{th}\$ first, we short circuit \$V_s\$, We know \$R_1\$ and \$R_2\$ are in parallel which is ...
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Find Thevenin generator between MN

simulate this circuit – Schematic created using CircuitLab My task is to find Thevenin generator between MN. This circuit isn't like anything we did in class, and I have no idea about how to ...
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41 views

Confused about Thevenin’s Theorem

I have a hard time trying to understand why Thevenin’s Theorem is the way it is. As per the diagram below, I understand why we take our “Thevenin resistance” that way. But as far as the voltage is ...
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38 views

Why is the inductor crossed by null current in this simple circuit problem?

I'm new to EE. While doing some exercises, I encountered a problem where I have the following sine wave circuit, where: e(t)=10cos(1000t)[V], a(t)=4sqrt(2)cos(1000t+pi/4)[A], C=1[mF], L=2[mH] The ...
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36 views

Thevenin Resistance in a op amp circuit

I created this circuit and I am struggling on trying to figure out the Thevenin resistance for this circuit.
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24 views

Why do we suppress the input when calculating the Norton/Thevenin resistance?

When we calculate the thevenin/norton resistance of a 1-port circuit, we suppress the independent inputs, be it voltage or current. But, my textbooks do not explain as to why we do this. So my ...
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1answer
47 views

Thevenin equivalent with multiple sources circuit

Sorry if I may ask an idiot question, but its gonna be for few hours right now I have spent on this question. I am asked to find out the value of the voltage between points A and B, aka Uab, and I am ...
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55 views

Calculate Vth between A and B

simulate this circuit – Schematic created using CircuitLab In this circuit, I am asked to calculate Thevenin Voltage Vth between A and B. This is the first time I am asked to calculate Vth ...
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70 views

Voltage Divider Configuration of Transistor

I have a voltage divider configuration for biasing my transistor. The gain of transistor is lets say 150 which is typical value for BC547. What I want is limit the current flowing through the base to ...
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40 views

How does the position of the gound influences the node voltages?

Here is the circuit which caused a long sleepless night and I would like to explain why: I have seen similar schema in this question (How to calculate time constant for RC circuit with more than one ...
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112 views

How to find Rth (Thevenin Equivalent R) of this circuit

Suppose I find \$V_{th}\$ = 2 V. How to find \$R_{th}\$ seen from a,b? My effort is short ab, and then in this case, 2//4 = 4/3. Note here that, the line across \$R_L\$ is a node (short ab). So the ...
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41 views

Measure short cuit current of Thevenin equivalent circuit

To find Thevenin equivalence of a circuit seen from a point (to ground), we measure its open circuit at first. So I get Vth. From a lecture note of Lab, I read the following way to get Rth: Now ...
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58 views

How to find Rth for the Thevenin Equivalent Circuit?

So we were given this circuit to solve for I1, I2, I3, and lastly the Thevenin Equivalent Circuit. I was able to solve for I1, I2, I3. However I am having a hard time computing the RTH at ab. Here is ...
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46 views

Help with thevenins voltage

Have to find the power developing on the 7k resistor (I*U). Calculated (hopefully correct) Rthevenin to be 12k//4k which would be 3k. Circuit simulator shows that the current through the resistor ...
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87 views

measuring -3V with 3 resistors voltage divider

I know (or may be think) that I can scale the measurement of a 0 to -3.1V external battery to a analog pin ADC range of 0 to 3.3V, but I'm unable to calculate the resistors. I've been trying how to do ...
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1answer
51 views

Can we apply maximum power transfer theorem to SMPS rectifiers?

Thevinin and Norton equation simplifies BJT and MOSFET analysis leading to the hybrid pi models. Can we apply the same concept while analysing an AC-DC Converter with PFC and PSFB full bridge topology?...
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94 views

To find the maximum power that can be delivered to resistor that is specified

I have to find out the maximum power delivered to a load which is already specified. It would not have been a problem if the load was not specified. In that case, I could have used Thevenin‘s ...
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2answers
49 views

Finding the current trough resistor in a closed mesh

In a closed mesh we have: simulate this circuit – Schematic created using CircuitLab The question is to determine the current through the 2nd resistor \$\text{I}_x\$. My work: I think of ...
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2answers
64 views

Solving Thevenin and Norton Circuit

simulate this circuit – Schematic created using CircuitLab How to solve this circuit for Thevenin and Norton circuit given RL in the circuit. My guess is to remove RL (open circuit). But I'm ...
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75 views

Calculate Norton equivalent in a circuit with a voltage controlled voltage source

I'm trying to solve a problem related to dependant voltage sources. I need to provide two answers which either I can't obtain or don't understand why I have obtained it. What I have done This is a ...
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240 views

LTspice XVII solving Thevenin Resistance basics

Thevenin voltage is a snap, but how do I get R Thevenin?
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23 views

What is the contribution of dependent sources while calculating the Thevenin’s Voltage?

I was solving a problem and while calculating the Thevenin’s voltage the dependent voltage source contribution was not taken into account.Why?What important concept am I missing?
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25 views

Solving for open ckt voltage and short circuit current

I am unsure if I did the KCL for node A for the short circuit diagram correctly. I used the ia value from the open circuit and used it to find iy. Please let me know if I am on the right path or if ...
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581 views

Contradiction:Maximum Power Transfer and High resistance of load

Whenever we load a circuit, there's a drop from the open circuit voltage \$v_{oc}\$ due to the internal source resistance or Thevenin's resistance\$R_{th}\$. So we need to have an \$R_{load}\$ that ...
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182 views

Using Thevenin's theorem, how do you find the Thevenin voltage?

The above image shows a circuit. It is required that we simplify the circuit using Thevenin's theorem to find the Thevenin voltage, current and resistance. I've done a countless number of problems ...
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91 views

Thevenin's Theorem: Why is there a \$R_{th}\$

Consider a linear mess present inside the box, simulate this circuit – Schematic created using CircuitLab If there's a voltage drop \$v\$ across the load, then why cant we simply replace the ...
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65 views

Transformer and Thevenin Theorem

Consider an ideal transformer connected to a real AC voltage source (with output resistance Rg). Now consider to apply the Thevenin theorem between the output terminals of the secondary circuit. I ...
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1answer
92 views

Determining the Thevenin Equivalent

How could I proceed with this circuit to determine the Thevenin Equivalent? I have the values of \$R_1, R_2, R_3, I_2\$ and the time value for g. I first tried to figure out the total voltage for the ...
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1answer
132 views

Thevenin Voltage and Resistance Problem

Please help me with this problem I have been set. So, I have successfully used Kirchhoff's Voltage law to determine the voltages and currents across each of the resistors in question (R2 and R3). ...
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1answer
58 views

Everyone knows this thevenin equivalent, but is it the same as this?

My question is, in the picture on the right can we switch the voltage source and the resistor and everything will still be the same? the circuit would look like b-Rth-Vth-A. Will everything still be ...
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2answers
64 views

Exercise question about Thévenin theorem

I'm new to Thevenin's theorem and I'm trying to figure out this simple one. I did what's on the next figure. I'm wondering If I can join the cables as I did and I could say that the voltage across \$...
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1answer
33 views

Conceptual Question About Hemholtz-Thévenin Theorem

I've been taught that for the Hemholtz-Thévenin's method I need to add an independent voltage source with a current flowing and at the same time "turn off" independent sources of voltage and current ...
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1answer
110 views

How can I reduce this circuit to a source in series with a single impedance?

How can I Thevenize the following circuit looking into the out terminal: I want to deduce this circuit to a source and a single series impedance. Here what I tried: \$\frac{R1\cdot R2}{R1+R2}\$ is ...
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1answer
31 views

simple circuit analysis kcl kvl

can i know what, why and how this Rth is parallel / how its calculated? answer by jonk: thevenin analysis i mean my solution would be: I1 = I2+ I . I1 = (9-V2)/10k I2 = V2/20k I = V2-...
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Thevenin Method

I need help solving the following circuit using the Thevenin method: simulate this circuit – Schematic created using CircuitLab The unknown in this problem is current i5, the correct answer ...
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1answer
95 views

Thevenin equivalent of the following circuit

So...I have to find \$v0\$ using exclusively Thévenin/Norton equivalents. I am completely lost since in this case I have a dependent voltage source which relies on \$v0\$ itself. \$v1,a,R1,R2\$ and ...
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62 views

Thevenin seems unclear

How do I find these answers? For the first example, R = 3/22, on the second it equals 18/17. I don't see how these will help me find ...
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88 views

Thévenin's Theorem Example

I just started learning Thévenin's Theorem. My textbook gives the following example: I'm referring to online sources such as this to complete this problem. However, all of the circuit diagram ...
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1answer
57 views

Finding Norton voltage and resistance and max power

My directions for this problem are to find the power delivered when RL=3 and then find the maximum power. simulate this circuit – Schematic created using CircuitLab I found Rth = R1//R2 = 1 ...
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106 views

Thevenins Theorem

Can someone please help, I'm struggling with this circuit. I don't quite understand what I need to do, mainly with whats series and parallel. My tutor is not helpfull in the slightest! He' only given ...
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3answers
125 views

Thevenin's theorem equivalent circuit

I had an homework to do for school. One of the questions of this homework was to find the equivalent of a circuit using Thevenin's theorem. Unfortunately, my teacher told me that I didn't get the ...
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Intuition on Thevenin's Theorem

In the following lecture by Prof. Anant Agarwal at 36:00, he intuitively proves Thevenin's Theorem using the following circuit simulate this circuit – Schematic created using CircuitLab If ...
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What is the Thevenin Norton equivalent of the folloing circuit

I am trying to find the Thevenin Norton equivalent of the folloing circuit. I am familiar with the procedure. However, when I am taking off the voltages to calculate the equivalent resistance, I am ...
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1answer
122 views

NPN Transistor common emitter calculation

I built the following circuit in LTSpice using the default NPN BJT model (beta = 100). I calculated the Ib to be 115.754uA. This is how I did the calculation: Equivalent voltage at base is: ...
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How do I find the Thevenin voltage and resistance equations of this circuit?

How do I find the Thevenin voltage and resistance equations of this circuit, with respect to the terminals U and G when Rc, Vc, Rt, and Rtrans are given?
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80 views

Thevenizing a Circuit when current through load is a paramter

The question is to find the current i in the following circuit. simulate this circuit – Schematic created using CircuitLab My Attempt: I considered \$10\:\Omega\$ resistor as the load. ...
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204 views

Calculating Short Circuit Current when Nortonizing a Circuit

My objective is to find v (voltage drop across 8 ohm) in the below circuit. I was able to thevenize the circuit successfully (V thevenin = 12 V and R thevenin = -2 ohm) and find v. But I find it ...
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89 views

How to apply Thevenin's Theorem to this circuit?

I have been trying to solve this question with either Thevenin's Theorem or Norton's Theorem but I got stuck at finding the Vth . Load Resistor is 5Ohm resistor in the middle . I have removed the ...