Questions tagged [nodal-analysis]

A circuit analysis method in which Kirchhoff's circuit laws are used to determine the voltage between all nodes (points where circuit elements connect) and the current through all elements. Always using in conjunction with the "circuit-analysis" tag.

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Use the node-voltage method to find the power developed by the 20V source in the circuit

All the information of the circuit elements are shown below. Question : Use the node-voltage method to find the power developed by the 20V source in the circuit.
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MNA matrix of a vacuum tube

I've been working on a project involving a digital model of a vacuum tube. We're currently experimenting with a Wave Digital Filter approach. Now I've been reading Kurt Wegner's fascinating work and I ...
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Why does my solution to this nodal analysis problem not work?

Observe the following schematic, in which I am trying to calculate the value of \$V_1\$: Let \$i_1\$ be the current in the left hand loop. Then \$i_1 = v_1 \div 50 \$ and also \$i_1 = (600 - v_1) \...
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How to do this nodal analysis problem with voltages sources plus a series resistance

I don't know what I am doing wrong, but it seems I got every number close to the answer but not the answer itself. Here is the circuit: For my first try I took the top node as V1 and the bottom as ...
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What are right or best analysis method on finding voltage, current and ohm in circuit analysis?

I'm new to electrical engineering. In the few past weeks, I already learn about different analyses to find what to find. Like finding voltage, current, and ohm with different methods. Examples like ...
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How do I solve the circuit below using nodal analysis?

I would like to know how I solve this circuit using nodal analysis source My attempt:
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Is the pulse voltage MNA matrix stamp the same as a normal DC voltage?

I am currently doing research on circuit simulators and trying to understand their techniques for simulating specific components. Now, I am at the state of trying to do transient simulation using ...
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Nodal Analysis wrong result

I'm trying to solve this problem, where I have to find the voltages v1 and v2. This is the circuit: This is what I came up with: Then I calculated the inverse matrix using WolframAlpha. Finally, ...
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Is "nodal voltage" a bit of a misnomer? Is there really just one voltage at a node?

The admittance model (of power systems) only ever seems to associate one voltage with any given node or busbar (e.g., just V1 at node 1 in the figure below). Is there an implicit assumption here that ...
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Nodal analysis with LEDs

How does nodal analysis work if I have not only resistors but also LEDs in my circuit? Do I then have to convert the LEDs to resistors somehow?
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3 answers
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Circuit analysis: connecting positive terminal of battery to reference node

In the circuit given below, how can I apply KVL to the loop on the right side? The reference node being connected to the positive terminal seems wrong.
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Laplace transformations of dependent sources

The following example is from the book Fundamentals of electric circuits by Charles K. Alexander. I don't understand how the dependent current source of 2δ(t) in the question becomes a 2 A current ...
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7 answers
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How can same points have different current?

Aren't B and D the same point and shouldn't it actually be (B and B)? If they aren't the same point what should be the current from B to D? Why is it 2 amperes (from the answers) and not 10 amperes as ...
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Analysis of circuit with dependent voltage source with no apparent solution

This is an exercise from Irwin's book, 9th edition. simulate this circuit – Schematic created using CircuitLab Although the book calls for the use of nodal analysis, I decided to do it by mesh ...
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Nodal admittance matrix of a winding

I have a question concerning the nodal admittance matrix of a winding that has n turns. If each turn of the winding had its own model, is it possible to consider my winding a n-port network?
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How to determine current direction in node voltage analysis?

I have this circuit in which I'm required to find the Power produced by the Current source \$0.2A\$ : So I Add ground to \$V2\$ and did node voltage analysis such as : $$ \begin{aligned}V_{0}:\dfrac{...
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Can't find error in nodal analysis

For the following circuit I did node analysis in order to find the greatest possible power at R and ended up with the equations (using node analysis): $$n_1:\frac{v_1-V}{R_1} + \frac{v_1}{R_2} = 0$$ $$...
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Current direction inconsistency in Nodal Analysis

I'm very confused here! Most of the times I'm getting wrong answers or impossible equations because of this - even if I know the procedures for the analysis. It has to do with setting up nodal ...
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How does Kirchoff's current law work for sinusoidal voltage sources?

I was solving a steady state question with sinusoidal AC voltage source and the solution for the question used Kirchoff's current law to find the nodal voltage of a node. Now, I used to think that I ...
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Dependent source circuit find voltage

Suppose we have this circuit simulate this circuit – Schematic created using CircuitLab How to do nodal analysis for this circuit? Is it $$5-\frac{5-V_{A}}{2}-V_{A} = 0$$? or $$5-\frac{5-V_{A}}{...
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Why do I read 20 microamperes instead of 5?

I am trying to do this experiment, but I can't read the current Ib. Note that the multimeter I use in this experiment is very sensitive. I don't know much about BJT transistors, so it might be an ...
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Op-Amp nodal analysis

Why is i20 = (Va-Vb)/20k, not Va/20k?
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Modified nodal analysis of a half wave rectifier?

I am trying to solve a halfwave rectifier circuit using the modified nodal analysis algorithm in MATLAB. The MATLAB code is given below. I am not able to see where the flaw is in the approach. I will ...
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Finding Transfer Function of RL Circuit

Can anyone help me to find TF of this RL Circuit
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Transfer function for Sallen-Key notch filter

How can I find the transfer function H(s) of the following circuit by using impedance of the circuit? Should I instead do it by nodal analysis?
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Linear model of diodes for mesh current and nodal voltage analysis?

If we use the piecewise linear model for diodes, can we apply mesh current and nodal voltage analysis to a circuit containing a diode?
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Nodal analysis in circuit contain voltage controlled voltage source

I have a circuit below and I need to determine the potential at \$v_1\$ and \$v_2\$. I have 3 questions: simulate this circuit – Schematic created using CircuitLab How do I use nodal analysis ...
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Nodal and Mesh analysis

I need to find the currents on each resistor of this circuit: Where \$\beta\$ is a constant with units of resistance. Applying Kirchhoff's laws the equations are: $$ I_1+I_3-I_2 = 0 $$ $$ V_0-I_1R_1-...
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Struggling to design R2 to simple circuit specifiations

I have set up a nodal equation such that all currents are entering the center node (\$V_x\$): $$\frac{V_1-V_x}{R_1} + \frac{V_2-V_x}{R_2} + \frac{V_3-V_x}{R_3} = 0 \to \frac{V_1-V_x}{R_1} + I_2 + \...
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Node voltage calculation

I'm designing a protection circuit and I'm assuming the following hypothetical situation represented in the figure below, where I need to determine the value of Vx. Does anyone have any suggestions on ...
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Is nodal analysis applicable to a circuit containing a DC and AC supply?

I think I can solve it using superposition but I am wondering if the nodal analysis is applicable to a circuit containing both an AC and DC supply? I am having trouble with what frequency I should use ...
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Extract the nodal admittance matrix of a given circuit in LTspice

I am wondering if there is a way to extract the Nodal admittance matrix of a very complicated circuit using LTspice. Like draw the circuit or automatically generate a netlist (in the case of a very ...
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3 answers
301 views

How would you solve this circuit with nodal analysis?

How would you solve this circuit with nodal analysis? I know it's the difficult route but it's a requirement. I understand that I need to create a super node that combines nodes a and b, and I have ...
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Nodal Analysis and Matrices for more complex circuits

I would like to know how I should write a matrix equation for a circuit containing dependent sources, diodes, capacitors, and voltage sources. I am familiar with the \$\small G V = I\$ matrix equation ...
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Mutual inductive coupling in a nodal admittance matrix

I have this question that has been haunting for quite a while now. To compute the nodal admittance matrix \$Y_N\$ of an electrical network, one can make use of the incidence matrix and the branch (or ...
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5 answers
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Determine Thevenin's equivalent circuit

I am doing my first year of engineering and have EE as a compulsory course. My teacher recently gave this question in an exam. He gave me a 5/10. He is not answering anybody's doubts. Can anyone tell ...
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How to find V1 and V2 using Nodal Analysis?

I would like to use Nodal Analysis to find the power absorbed by 2 Ω resistor, V1, V2, and V3. For V3, it clearly shows that it is -24V. I would like to ask is V1 the same as Vy, or they are different ...
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Why is a resistor between a node and a current source not considered when doing node-voltage method?

I'm trying to get V2. When looking at the solution, I see that for the node V3, this is what they have: $$\frac{V_3}{100}+\frac{V_3-V_4}{200}=0.15A$$ I'm wondering why they're not considering the ...
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Nodal Analysis Newbie Question

So I was solving some nodal analysis questions for practice and I can't figure out the equation for Node 2 at I2. The voltage at node 1 is V_A and Voltage at node 2 is V_B. A little side note is that ...
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Where have I gone wrong with this nodal analysis calculation?

I am a bit confused as to where I have gone wrong in my nodal analysis calculation: For the first node v1: $$-3=(v1-v3)/2 +(v1-v2)$$ v2: $$-(v1-v2)-(v3-v2)/4 = v2/3$$ v3: $$7=(v3-v4)/5+(v3-v2)/4+(v3-...
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Nodal Analysis - Kirchoffs Current Law

Hello, I am stumbling across an issue here. So in Nodal Analysis, we identify our reference point and label the voltage nodes. Then we use KCL to find out equations and solve. My book is providing an ...
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Nodal voltage after a resistor

I know this is an extremely trivial question especially after studying thus far, however, I still can't wrap my head around how we are supposed to calculate the nodal voltage depicted below: In this ...
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RL Transient Analysis confusion

simulate this circuit – Schematic created using CircuitLab When I am using Thevenin's circuit and deriving inductor currents equations i am getting different Time constant \$ \tau\$ from what I ...
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Beginner nodal analysis exercise: Why would the voltage of the output of the op amp swing from 15V and 0V when op amp is in the follower configuration

I wanted to analyze the function of this circuit. When I simulate it the output of the op amp swings from 10 and 15V, but I can't seem to get there based on my analysis (by hand.) Say we start off the ...
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Joining two parallel branches with a wire

In the above circuit (grounding the negative terminal of the battery,) will the potential at C and D be the same? According to my physics teacher, the potential is the same at the two points. Why is ...
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2 answers
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What is the op-amp output voltage for a voltage-controlled current source?

I am trying to analyse the voltages in a voltage-controlled current source. What I have so far: Vin = V_C V_B = Vsupply - I_shunt*R_load However, I don’t know how to find an equation for the op amp’...
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Transfer function : Determination [closed]

I have the below circuit, here, I have Is and Va are measurable quantities. Rc1..Rc4 and Rbd are unknown variables for which I intend to derive transfer function. I have flexibility of adding ...
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Transfer function : Complex network

For the attached circuit attached in LTspice spice, I am trying to find the transfer function interms of Rc1,Rc2,Rc3 and Rc4. For that I have switches which I configure to turn on/off and measure the ...
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how to find gain of this complicated circuit?

I am having trouble with the following circuit. This circuit is AC model of Colpitts oscillator designed with NPN type BJT transistor. I am trying to find loop gain and check if it meets Barkhausen ...
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1 answer
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LTSpice outputting the incorrect voltage reading?

I have analysed this circuit by hand using both mesh and nodal and always come to the same voltage reading. However, when I simulate it in LTSpice, it does not match. The V1 node reading should be 9....
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