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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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1answer
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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
55 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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1answer
59 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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2answers
56 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
32 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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2answers
83 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
89 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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1answer
113 views

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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60 views

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
91 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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1answer
38 views

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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2answers
58 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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1answer
53 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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3answers
72 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 ...
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1answer
28 views

Confusion between Input/Ouput Impedance and Thévenin's theorem

I'm bit confused about what Input Impedance or Output Impedance is. I tried to read Wikipedia's page (https://en.wikipedia.org/wiki/Input_impedance) but I find it hard to follow. Is the Input ...
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0answers
36 views

Equivalence between two circuits

the problem I was working asked for the Thevenin equivalent of a circuit, requiring it to be done in two steps and then to "join" the parts together. The top circuit is the one I came up with, but the ...
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1answer
62 views

Potential difference between these points

I do not know how to approach this problem or which theory to apply. Could you please help me to find out the potential difference between the points A and B in the circuit given below.
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0answers
46 views

Thevenin Equivalent circuit, concept question

I am looking at the circuit in: Apply Thevenin Theorem to a circuit with 2 sources? The circuit and its equivalent have been given as follows in the thread: Circuit: Thevenin Equivalent: Instead ...
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1answer
63 views

Find Rth using the given diagram [closed]

simulate this circuit – Schematic created using CircuitLab
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0answers
22 views

Finding the equivalent Thevenin generator

I have 2 circuits of which I'm supposed to find the Thevenin's generator equivalent. I solved the first one (hopefully correctly), but am unsure how to solve the second one. The result of the first ...
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3answers
2k views

Thevenin Equivalent Voltage: why ignore the 3-kΩ resistor?

In order to find the Thevenin voltage here, why is it that the 3k Οhm resistor is ignored and no current goes through it? (hence \$V_{TH}=8mA \cdot 7kΩ = 56V\$)
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3answers
57 views

Norton <-> Thévenin equivalents with complex impedances

Given a Thévenin equivalent circuit, it's pretty easy to convert to the Norton equivalent, or vice versa: simulate this circuit – Schematic created using CircuitLab Although the value of the ...
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1answer
68 views

How can I find the short circuit current across a and b?

In order to find R thevenin, I need to find Isc across a and b since there's a dependent source. Based on my calculations, Vth=500/3V. I've spent countless hours thinking about Isc,please help.
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1answer
38 views

Understanding CMOS Circuit Behaviour with Resistive Loads using Thevenin theorem

I have been reading the Digital Design: Principles and Practices 3rd Edition as a hobby. Unfortunately, I am stuck at page 103 of Section 3.5.2: Circuit Behavior with Resistive Loads. In Figure 3-27: ...
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3answers
55 views

why would Ix would be 0?

Current coming out of the 5V source would never be 0 so what would make the current coming out of the 3v dependent source 0?
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3answers
69 views

Redrawing circuit diagram for Thevenin's theorem

We're looking for Uo voltage but that's not the issue (yet). My problem is I don't know how to redraw this diagram in a way so that I'm able to see the resistors connections and compute the equivalent ...
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1answer
37 views

Dependent sources removal

In thevenin's and norton's theorem why do we dont remove the dependent sources in calculating the thevenin's resistance. And secondly,why do we only use 1 ampere/1 volt source to find the thevenin's ...
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1answer
54 views

Understanding some mistakes, when trying to find the Thevenin equivalent

I was asked to find the Thevenin-Norton equivelant, and I got stuck on some things that I can't quite understand. I don't know if i need to be more specific. What's wrong with the following? And why ...
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2answers
103 views

Thevenins theorem + two diodes and a resistor using graphical solution

I've got a homework to solve this circuit by a thevenin's theorem and get a current and tension of the diodes using graph. I've looked all around the Internet and couldn't find one single video that ...
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1answer
42 views

For the circuit shown find the Thevenin’s equivalent circuit between terminals A and B

Here I began with Vth making mesh equations : 48-6I1-12(I1+I2)=0 12(I1+I2)+42+8I2=0 With which I get I1=4A & I2=-2A Then I considered the open circuit part AB to use the 2 mesh currents there ...
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1answer
41 views

How to find thevenin's eq circuit from the given figure? [closed]

So I started with finding Rth shorting all voltage sources and opening all current sources getting at 10||5 case getting it as 10/3 = 3.33 ohms. After that using source transformation I changed the ...
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2answers
66 views

Combining perfect voltage and current sources

I am attempting to reduce the circuit shown into a form of a single voltage source and resistance in series using Thevenin and Norton conversions. I approached the problem by first considering a ...
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2answers
179 views

Why maximum power transfer condition is suitable for communication system but not for transmission of electricity?

A fundamental concept that i have learned from basic electrical circuit study is to receive maximum power by a load of resistance RL from a source the necessary ...
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1answer
47 views

Calculate the Norton Resistance and Current and the Thevenin Voltage of the following circuit

U=10 V, R=10 ohm I calculated the resistance as such: 1/Rt = 1/R + 1/R <=> Rt = R/2 = 5 ohm To calculate the voltage I did KVL as such: U - 2Ur = 0 <=> Ur = 5V, where Ur is the voltage in the ...
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2answers
54 views

Calculating the Thevenin Voltage of this circuit

What I did was apply kirchoff's voltage law to the closed network with the 2 resistors and the voltage source to calculate the voltage of the resistors. I got U - 2*Uresistor =0 <=> Uresistor =5V ...
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1answer
95 views

Thevenin equation of a circuit with two voltage sources, one on an open circuit

I am incredibly sorry, as I'm sure this specific example has been asked before, but I missed the class on it and the professor hasn't yet uploaded the video to his website. I need to know how to find ...
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1answer
40 views

Finding the energy over the capacitor in DC

I tried using Thevenin to solve this and found Rth = 3 and Vth = 12 but this is way off the correct energy of the capactor (the energy is 4J).
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2answers
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Modelling a temperature measurement system

The accuracy of a measurement system can be significantly reduced by loading effects in the system. A thermocouple is used together with an indicator to measure temperatures. The thermocouple has a ...
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1answer
47 views

Thevenin and resistance problem

I had a problem finding the Thevenin equivalent resistance of this circuit. If anyone could help me, I would be very thankful.
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2answers
42 views

Thévenin's theorem exercise, resistances

I've some problem identifying the \$R_{th}\$ simulate this circuit – Schematic created using CircuitLab Removing the load and short circuiting the Voltage source we get : simulate this ...
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2answers
35 views

Source transformation violation

Using thevenins or norton theorem, we can easily find current through the resistor as 1 amps. But if we convert the current source to voltage source , current turns out to be zero amps . Why?
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1answer
44 views

Finding Thevenin equivalent circuit and using that circuit when terminals inside circuit

Sorry for the bad title, but I'm trying to get the Thevenin equivalent circuit and then use that circuit to calculate a current i. The problem I'm having is I'm not sure what to get the open circuit ...
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1answer
47 views

Circuit Analysis in Non-Closed Systems

So I'm fairly confident in my ability to do circuit analysis on closed circuits, that is, circuits where all loops, sources, and elements are given. However I still find myself getting stuck on ...
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3answers
179 views

how can we solve a circuit with two opposing voltage sources using thevenin theorem

i have been asked to solve a circuit using thevenin theorem but when i try to solve it to find Vth by loop analysis, i realized that both voltages are in opposing directions and i can't understand ...
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2answers
82 views

Struggling with Thevenin Equivalent Problem

I had asked this question before and thought I had found the help I needed, but unfortunately I found myself unable to solve the problem fully when I attempted it. The problem: For the Thevenin ...
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1answer
144 views

Can a Dependent source be dependent on itself?

I am looking for the Thevenin Resistance here. However, I have no clue what to do with \$i_b\$ and the source dependent on it. This is the entire circuit. \$i_b\$ is the current through the 5\$k\...
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1answer
83 views

This circuit is two parallel resistances of 10Ω. Convince me otherwise

I'm trying to find the Thévenin equivalent resistance of a circuit - one that resembles a Wheatstone bridge, but is not at balance. The load in question is where the galvanometer would appear. Anyway,...
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2answers
288 views

Thevenin Equivalent Network: How to treat Capacitor across 0v potential, with Dependent Sources?

We were given this question in our intro to EE course: Find the Thevenin equivalent network between points a and b for the circuit shown in the image below: For the short-circuit current, I redrew ...
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2answers
104 views

Confusion with short circuits, and when you can ignore a loop

For the image above, when t<0, howcome it's safe to ignore the loop with the 50V source, and the 60 and 200 ohm resistors? How do you know when you can ignore a loop, or when to ignore a part of ...
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1answer
47 views

Is my approach for the RL circuit correct?

For the image above, i(0+) = i(0-) = 0A, and to get the IL(t) function, you solve for Rth, which is 50ohms. Afterwards, i'm confused with how to approach getting IL(t).