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.

Filter by
Sorted by
Tagged with
0
votes
2answers
35 views

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 ...
0
votes
1answer
40 views

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 ...
1
vote
3answers
155 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 ...
0
votes
0answers
27 views

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 ...
0
votes
1answer
40 views

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 ...
5
votes
5answers
396 views

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 ...
3
votes
4answers
672 views

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 ...
1
vote
0answers
47 views

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 ...
0
votes
0answers
50 views

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 ...
1
vote
2answers
108 views

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-...
3
votes
1answer
69 views

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 ...
0
votes
1answer
47 views

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 ...
0
votes
1answer
51 views

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 ...
1
vote
1answer
75 views

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 ...
1
vote
2answers
86 views

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 ...
2
votes
2answers
162 views

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’...
2
votes
1answer
101 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....
2
votes
1answer
108 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 ...
4
votes
1answer
181 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 ...
1
vote
4answers
163 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 ...
2
votes
2answers
367 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 ...
0
votes
2answers
277 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 ...
0
votes
1answer
60 views

Electrical Circuits Analysis Help

Am I correct? Or does D= V1-20, which allows the value of V1 to be positive?
0
votes
1answer
50 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 ...
0
votes
0answers
43 views
-2
votes
2answers
164 views

How can we calculate V2 by nodal analysis in the following circuit?

How can we arrange it or solve by nodal analysis.
0
votes
3answers
914 views

how to find Thevenin Equivalent Voltage and Thevenin Equivalent Resistance?

pls help me solve this question it’s confusing me
0
votes
0answers
55 views

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 ...
1
vote
0answers
37 views

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 ...
1
vote
1answer
115 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 ...
2
votes
3answers
245 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 ...
1
vote
1answer
67 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:
3
votes
1answer
81 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 ...
0
votes
0answers
46 views

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 ...
0
votes
1answer
111 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 ...
2
votes
4answers
1k 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 + ...
0
votes
2answers
169 views

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.
0
votes
1answer
1k 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}}...
3
votes
1answer
589 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:...
1
vote
1answer
56 views

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 ...
-1
votes
1answer
171 views

Thevenin Nodal analysis

Anyone has any idea how to deal with this tricky circuit using Thevenin?
1
vote
2answers
357 views

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 ...
0
votes
1answer
144 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 ...
2
votes
0answers
43 views

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. ...
0
votes
3answers
420 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?
0
votes
1answer
129 views

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, ...
0
votes
1answer
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 ...
0
votes
3answers
120 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 ...
0
votes
2answers
526 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 ...
0
votes
1answer
68 views

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?