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.

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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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Identifying nodes with multiple ground symbols/two dots in the same apparent node

I'm reading the Art of Electronics. Figure 1.18 is the circuit given below. I'm learning about nodal analysis, and have two questions. First, this image contains three "ground" symbols. ...
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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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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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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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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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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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1 answer
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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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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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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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Strange Nodal Analysis

I have done the nodal analysis for the following question, and everything appears to have been done correctly as far as I can see. However, when I simulate the results I get values for the circuit ...
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4 votes
1 answer
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Find current 'i' using Nodal Analysis

Here I know how we apply nodal analysis, but can somebody explain how can we calculate the current 'i' if there is no resistor in that particular wire? I have shown my approach and working so far. I ...
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4 answers
280 views

Nodal Analysis Current Direction Matters

simulate this circuit – Schematic created using CircuitLab I'm currently doing a question and it appears to me that the direction of the current matters. For both the batteries I've assigned a ...
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Supernodes and KCL

Lets talk about Colpitts oscillator again (or the very basic circuit theory if you want). Suppose I modeled circuit as on the schematics below I am interested in systematic ways of obtaining circuit ...
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Solving nodal analysis equations using matrices- gives a full rank matrix

I am trying to solve for node voltages in a circuit using nodal analysis. I am using the fact that the sum of the currents into each node must equal 0. I have a system of equations which can be ...
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Electrical Circuits Analysis Help

Am I correct? Or does D= V1-20, which allows the value of V1 to be positive?
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DC Circuit Analysis from Sergio Franco Book : Electric Circuit Fundamentals

If current source is absorbing power then the polarity wise Vb will be +ve.Then i calculated the value of Vb=4 x 2A = 8V Va= Vb + (20*2) = 48V and Vs = 164V Thus for current source to absorb power of ...
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when there are 2 opamps in a circuit working simultaneously how do we sketch transfer characteristics?

could you please help me finding transfer characteristic (v2/v1) of this circuit.
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How can we calculate V2 by nodal analysis in the following circuit?

How can we arrange it or solve by nodal analysis.
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3 answers
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how to find Thevenin Equivalent Voltage and Thevenin Equivalent Resistance?

pls help me solve this question it’s confusing me
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Where does this resistor appear in my nodal analysis? [BJT small signal analysis]

Here is my small signal circuit of a PNP common base amplifier with a resistor Rin at the emitter, Rl at the collector and a voltage source Vb at the base. Here is my large signal circuit: simulate ...
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Need some help with nodal analysis

I have this circuit where I'm supposed to find the current I. I know I'll find it by (V3-V4)/R10. I have done the nodal analysis, however, my teacher says that I have done my nodal analysis ...
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1 vote
1 answer
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How to use nodal or mesh analysis with a current source?

This is my circuit: The task is to get \$V_0\$ using Norton's theorem. My problem here is how current sources work. I tried to use mesh analysis first, but didn't know how to. Then I tried to use ...
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2 votes
3 answers
522 views

Question about nodal analysis with an ideal op amp circuit

Iam trying to do nodal analysis of this op-amp circuit, but iam not quite sure if I have done it correctly or if I have missed something. The op-amps are considered being ideal so there is no current ...
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1 answer
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How do I calculate the K for the dependant source using nodal analysis?

The question has provided power supplied by the voltage source and Vab = -3.6 V. I had tried several ways but still can't solve it. Below is the solving steps I tried:
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RC Circuit Analysis Direction Changes Formula

In my Circuit Theory lesson, we were studying RC circuits and there was a question which I tried to make before our senior but I accidentally came up with a different answer due to choosing current ...
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Is my current flow annotations correct?

I have this circuit given and we're asked to get the contribution of the 75V source to iR using superposition. The yellow and red line in the picture are my assumed current flow. However, I couldn't ...
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1 answer
131 views

Multiple voltage dividers : finding resistances in a circuit

I have to set the battery voltage to 14.5V from the first divider, then from that I have to attenuate it to 1V to feed to the input of an op amp. Now this answer is inspiring but doesn't solve my ...
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2 votes
4 answers
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How to find the nodal voltage when there is a voltage source across two nodes?

How to find the nodal voltage when there is a 40V across Node 1 & 3? V1= 22.4 V V2= 65.6V V3= 62.4 V My Nodal Analysis Node 1 (SuperNode): -V1/4 - V1-V2/3 + V2-V3/2 - V3/6 = 0 Node 2 V1-V2/3 + ...
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How can you tell what is the net direction of current flow when there are two opposing sources?

How do you tell whether the 12V source will overpower the 5A source at the 4ohms resistor? Changing the net current direction in Node V2. Or vice versa, if the 5A source is stronger than the 12 V.
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Nodal Analysis using voltage sources

Find v and i in the circuit of Fig.3.11 I modified the circuit like: and renamed the nodal voltages: Now applying KCL at the supernode, $$i_1+i_2=3.5....(i)$$ We know, $$i_1=\frac{v_1}{\frac{12}{7}}...
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3 votes
1 answer
908 views

Determine the nodal voltages in the circuit

This is a practice question from book: Engineering circuit analysis / William H. Hayt, Jr., Jack E. Kemmerly, Steven M. Durbin. — 8th ed. (pag. 91) . Determine the nodal voltages in the circuit: Ans:...
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1 vote
1 answer
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finding the current in a branch with resistor, capactor and a voltage source

I'm solving a question in Linear circuit analysis 2 class. the question is to analyze a switching circuit with inductors and capacitors. this is the circuit in the time interval drawn in S-domain ...
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