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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 ...
30 views

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 ...
71 views

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 ...
31 views

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 ...
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 ...
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 ...
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.
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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?...
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 ...
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 ...
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 ...
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 ...
240 views

LTspice XVII solving Thevenin Resistance basics

Thevenin voltage is a snap, but how do I get R Thevenin?
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?
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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). ...
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 ...
64 views