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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47 views

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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96 views

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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49 views

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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78 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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311 views

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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69 views

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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58 views

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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42 views

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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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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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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81 views

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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69 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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1answer
46 views

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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64 views

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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79 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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284 views

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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648 views

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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229 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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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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118 views

Thevenin Nodal analysis

Anyone has any idea how to deal with this tricky circuit using Thevenin?
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Supernodes in Series

I have this problem 3.32 from Fundamentals of Electric Circuits 6th edition by Alenxander and Sadiku. I have drawn the circuit in LTspice. My goal is to solve this problem using nodal analysis and ...
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83 views

MATHCAD for electronics circuit analysis usable for production testing

Do anyone have any Idea how to use MATHCAD for electronics circuit analysis. For example, can I find the Worst Case Analysis ( maximum and minimum values at testpoints) of a complex DC circuit for ...
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Trouble understanding how dependent current sources affect a circuit (Two-port networks)

While reviewing a problem from my recent test on two-port networks I noticed that it made its way online. When someone was explaining the solution they utilized a point that I just completely missed. ...
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205 views

How do I solve using nodal analysis when there is a battery before the resistor?

I need to use node analysis on the following circuit. I am confused as to how to solve node 1 as there is a battery of 3V between the node and 4 ohm resistor. Should I solve for it?
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What currents are entering/exiting this end of the supernode?

I assigned the following currents. For one end of the 14V supernode, I have i1. I'm not sure where the other end of the 14V supernode actually ends, so do I include only i3 in the KCL equation for it, ...
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45 views

Node analysis: estimating variable current branches

Is there a way to get the number of potential currents that could be in a circuit? (Note: in the following circuits ignore the Resistor value, I've just added a resistor with the default schematic ...
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3answers
95 views

Nodal analysis for resistive circuit

Given the following circuit: I know that I1 = I2 + I3, but what would be the relationship between I2,I3,I4, and I5? I would assume if there are 5 unknowns, we'd ...
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273 views

Number of independent KVL and KCL

I know that the number of KTL and KCL is related to the number of nodes \$N\$. For KCL there are \$N-1\$ equations while for the KTL there are \$L-(N-1)=L-N+1\$ equations. However I didn't understand ...
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TA says in the solution of this question that Va=v1-((v1-30)/20)*10 , how did he get this? [closed]

TA says in the solution of this question that Va=v1-((v1-30)/20)*10 , how did he get this?
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What is the value of Va,Vb and Vc by using nodal analysis?

Can i directly put the Vb value as 12v or is there any supernode in there? I tried applying KCL at Va,Vb (which i put as 12v) and Vc but got the wrong answer.
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Homework: AC circuit analysis correctness equations using nodal analysis

I've been struggling to find the equations needed to find \$V_o\$ and \$I_o\$ for the circuit given below. I came up with the following equations using nodal analysis and wanted to ask whether they ...
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217 views

Nodal Analysis: Resistor in front of Node A

In this section from a circuit, Va has two voltages going to it, but also has a resistor going to it as well. Most nodal analyses I've seen look like this. So Va is very easy to find. The resistor in ...
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298 views

Transfer function for Sallen-Key Low-pass Filter

How can I find the transfer function H(s) of the following circuit by using the nodal analysis? My thoughts woulb be: the equation for the node \$ i_1 = i_1 + i_3 \$ \$ i_1 = \frac{U_e - U_1}{R_1} ...
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nodal analysis, current direction

Right, first the diagram, I tried using the schematic function,but it never actually added the schematic. I picked this because it illustrates my confusion in the simplest schematic I could find. We'...
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1answer
72 views

Nodal analysis for dependent voltage source

I want to apply nodal analysis at the red marked node of the above circuit. Here is my equation : $$0.2v_0 - i_0 - 5 + \frac{v_3}{40} + \frac{v_3 - v_2}{10} = 0$$ My equation includes a supernode ...
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Performing small signal ac analysis with non-linear components

I have written a circuit simulator that uses Kirchoff's voltage and current laws to solve linear circuits containing capacitors, resistors, inductors and op-amps (where the op-amps are assumed to be ...
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What will be small signal trans resistance gain of shown circuit?

Take beta = 99. I analysed this circuit using first considering this circuit as feedback circuit with shunt-shunt type of feedback and then did the same analysis considering that the circuit is a ...
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112 views

How to find voltage gain of below analog circuit without using Nodal analysis?

This is a theoretical circuit just made to see that if I can find voltage gain of circuit and it took me much calculations then anticipated to get voltage gain.I just want to find if there is better ...
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Nodal analysis Example

Question:Find the Vo voltage using the node voltages method.Thanks in advance. I chose the following node as the reference node.I created the equations but i couldn't destroy the i delta.Because it ...
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91 views

Nodal Analysis verification

I've written equations of the circuit in the picture with reference to nodal Analysis. Not sure if I got the equations right.
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75 views

Nodal analysis of a basic DC circuit

I am trying to find the v1, v2, v3 and i5 using nodal analysis. I gave the name to the current over the respective resistors i3 and i4 and put it as i0 - i3 - i4 = 0 also write the equations as i3 = (...
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Where did this useful matrix decomposition come from for Nodal Analysis?

Background The equations formed when finding the nodal voltages of a circuit can be expressed using nodal analysis as a square system matrix \$\mathbf{S}\$ (lets say \$m\times m\$ where \$m\$ is the ...
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207 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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How do I calculate the collector current of this circuit with a bipolar junction transistor?

I need to calculate the collector current of this circuit, but I don't know how to approach it. I think the circuit is in the active zone but since my teacher isn't responding to my emails I'm not ...
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67 views

How can this circuit be solved with the node method?

I tried to solve this using the node method and it yields 0 on Mathematica, which I believe isn't correct. I'm trying to solve I1 first. simulate this circuit – Schematic created using ...