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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 use in conjunction with the "circuit-analysis" tag.

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How to solve for \$i\$ using superposition?

Second semester college student. But I'm actually confused on how I'm supposed to do this. I know that I need to find \$i\$ values on each voltage and current. a. 12 V on, 3 mA and 9 mA off. (\$i1\$)...
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How to solve this question by nodal analysis?

I have this circuit where I have to find the Thevenin equivalent. How do I solve this problem by nodal analysis?
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Finding transfer function of high-pass circuit

I've already done the calculations myself, but I am getting a completely wrong answer for the poles and zeros. I'm not sure what I am doing wrong. If someone could point out my mistake please I would ...
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Circuit Analysis Q's

When looking for the node voltages of the following circuit below I was wondering why we are not able to get the correct answer for node voltage V1 by solving the following way. I1 = V2/30 = 100/30 = ...
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Norton equivalent circuit

I tried to solve the problem below but I don’t know if it’s right.  Im finding I2 or the current when SW1 is open. I put a test voltage 1V between the nodes of 8 ohm and 6 ohm resistors so its in ...
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Incorrect current assumed in Hayt Ex 5.3

Here is Example 5.3 from Hayt "Engineering Circuit Analysis" p 129. I am supposed to solve it using superposition principle. While doing it I incorrectly assumed direction of \$i_x\$. I ...
user1700890's user avatar
4 votes
3 answers
680 views

Why does this op-amp circuit show current flowing like that?

This image shows an op-amp being powered. Is there any reason why it shows current flowing from the negative side of the bottom battery into the op-amp or why it shows current flowing from the ...
Analysis101's user avatar
2 votes
2 answers
152 views

How can there be no Thévenin voltage with only a dependent voltage source? [closed]

I don't understand why the Thévenin equivalent is equal to zero in this case because, if the load is a resistance, then yes, the circuit would be dead as there would be no voltage drop across Vx. But ...
Analysis101's user avatar
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Exponential stability of a general \$RLC\$ circuit with sinusoidal input

I conjecture that any \$RLC\$ circuit with \$n \ge 0\$ independent sinusoidal voltage sources of the same frequency is exponentially stable. How to prove this or if this is not true, how to modify the ...
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How to derive an ODE for a general n-th order LTI circuit?

I have seen in multiple books the following fact: Suppose we have an n-th order \$RLC\$ LTI circuit with and independent volatage source \$x(t)\$. Then a voltage \$y(t)\$ of some node in the circuit ...
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Nodal analysis doubt

Can we apply nodal analysis to find out the current in each branch for this circuit: I am having trouble to find the correct reference point where I can take V = 0. (If you are down voting the ...
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Including resistance between supernodes

Here,as per the circuit,we can take \$V_1\$ and \$V_3\$ with the voltage source across them as a supernode(as the area marked in red). In the red marked portion i.e supernode,we see that current can ...
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Equivalent resistance of network of resistors arranged in a cube shape

To determine the equivalent resistance across \$AB\$,I noticed that the three resistors in the lower face of the cube are in parallel combination. So I replaced all three with a single resistor \$\...
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Replacing resistances with equivalent resistance

In the above original circuit,by node analysis,we see that \$R_3\$ and \$R_4\$ are in parallel combination. So we can replace the two with an equivalent resistance \$R_e\$. For that we need to remove ...
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Analyze an RC circuit using either nodal or mesh analysis

How can I analyze the circuit shown in the diagram below using either nodal analysis or mesh analysis? I attempted solving the problem using mesh but ended up with the wrong answer. To obtain the ...
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How do I apply nodal analysis to this circuit?

Looking at the diagram below, I see the formation of a supernode that is different from the ones I've encountered before and I really don't know how to go about it. How can nodal analysis be used to ...
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How do I apply mesh analysis to this circuit?

I have applied the mesh analysis to this circuit using both clockwise and counterclockwise directions but I ended with different results. Please let me know if there's anything I'm doing wrong. Also, ...
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Special case nodal analysis

I tried to calculate, but I'm quite confused to go further. The calculations can be seen in the image itself. This is a special case, nodal analysis with special dependent voltage source branch. How ...
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Special case of nodal analysis

In this diagram, we see node V2, I can understand how it can be treated as a node. But I don't understand in the equation how \$-v2(0)\$ comes. I thought maybe the R for short circuit is 0, then also ...
Fredrick's user avatar
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Determining Thévenin voltage using nodal analysis

Here I want to determine \$V_{th}\$ without using mesh analysis and just by using nodal analysis. Now, \$V_{th}\$ is the same as the voltage across the \$6\ \Omega\$ resistor since no current passes ...
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Use nodal analysis to find Vo in the circuit of Fig. 3.72

I have been doing this sum with nodal analysis. As nodal analysis says when a voltage source is between to make a super node. But I cannot do KVL for the super node. Please help me with this question. ...
nithya manish's user avatar
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In the circuit of Fig. 3.49, current i1 is: (a) 4 A (b) 3 A (c) 2 A (d) 1 A

I am starting this subject i need help for this question. If anyone could solve it please tell me. I don't understand what to do with the nodal analysis. I am thinking to add the 2ohm and 3 ohm ...
nithya manish's user avatar
1 vote
3 answers
231 views

How can I solve this dual operational amplifier circuit with nodal analysis?

I'm somewhat unsure how to solve the Uout voltage of the above circuit using nodal analysis. Uout being the voltage at the right side obviously. I'm not entirely sure if what I have done so far is ...
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Calculations of mesh and nodal analysis of my dc circuit doesnt satisfy any of the KVL or KCL conditions

So I'm working on a course project under my professor and I seem to have encountered a huge problem. I built my own circuit and solved it using mesh and nodal analysis in MATLAB, got some values but ...
SpaciousCoder78's user avatar
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Which is the correct flow of current in these following circuits for nodal analysis?

My professor told me one method, a well known and trusted youtuber told another method and our assignment solutions have another method for nodal analysis so I can't figure out which method is ...
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1 answer
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Determining nodal voltages of a circuit with two supernodes

I am trying to determine the nodal voltages (namely, \$v_{1},\ v_{2},\ v_{3},\ \text{and}\ v_{4}\$). I have determined that there are two supernodes: one between nodes \$v_1\$ and the reference node ...
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1 answer
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Resistive network with two voltage sources

Update: (I updated the description/Question for clarity) I am currently stuck trying to solve a seemingly simple resistive network. The voltages U1 and U2, aswell as Rr are known. The unknown ...
new_user_3392's user avatar
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Node equations for Thevenin voltage

I have the following circuit as shown in the picture below: I am interested only on finding the \$V_{th}\$ and not the Norton current. I choose to work with node analysis because I find it easier. In ...
Homer Jay Simpson's user avatar
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1 answer
85 views

How do you use nodal analysis to this circuit?

By using mesh analysis I have 4 equations: 6ia - 2ib = 24 -2ia + 12ib -20ic - 2id = 0 -8ib + 12ic = 0 -2ib + 12ic + 3id = 0 Got ic = 8/3 A, so Vo = 4(8/3) = 32/3 V ; correct me if I'm wrong But I don'...
New student's user avatar
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360 views

Circuit analysis: how to find the voltage at node 2?

Find the voltage at node 1, 2 and 3 using mesh analysis. Using mesh analysis I have 3 equations: $$ 6ia+10ib-4ic = 0 $$ $$ -2ia-2ib+4ic = 10 $$ $$ ia-ib=-5 $$ With this equation I find the current ...
New student's user avatar
0 votes
2 answers
200 views

Simplifying a circuit for nodal analysis [closed]

I am trying to simplify/classify the following circuit: My textbook says it is a four-node circuit but I am coming up with 3 nodes. Doesn't the "Ref." dot and the rightmost dot combine into ...
kote's user avatar
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1 vote
1 answer
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Inconsistency when doing nodal analysis with supernode

I'm trying to analyse the following simple circuit by using nodal analysis but seem to arrive at an inconsistency if switch the direction of the assumed current \$ i_2 \$. Consider the following ...
Salvatore's user avatar
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1 answer
43 views

Nodal voltage analysis logic

I'm doing nodal voltage analysis on a circuit (zoomed in and cut out all but the relevant part in the picture), and ran into a situation I have no clue how to tackle. I don't understand how to figure ...
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Circuit Analysis Sadiku Book practice problem 3.4 Nodal Analysis

In Sudiku's Fundamentals of Electric Circuits book, this is practice problem 3.4. This is to be solved using Nodal Analysis. I managed to get 2 equations: $$v_1-25=v_2 \iff v_1-v_2=25$$ $$v_2+5i=v_3 \...
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1 answer
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Node analysis in Thevenin Equivalent

I have the following circuit and imagine at the right side of the capacitor there is an open circuit with two terminals A,B. There is one dependent source and one independent source.Therefore \$R_{th} ...
Homer Jay Simpson's user avatar
1 vote
1 answer
86 views

Performing Node analysis with more

Following a previous question problem regarding the node analysis with dependent source in a circuit I made some extensions that I would appreciate some validation if someone know. I have the ...
Homer Jay Simpson's user avatar
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2 answers
79 views

How can I perform Node Analysis with dependent source?

I have the following circuit as shown in the picture. My question is how can I perform Node analysis in this circuit in the node \$V_{0}\$? I want to find \$i_{1}\$ but without KCL or KVL. Just the ...
Homer Jay Simpson's user avatar
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3 answers
239 views

KCL confusion about currents direction

Sometimes when I use KCL for nodes in a circuit I cannot correctly determine the direction of the currents. My book also says that according to KCL the algebraic sum of currents entering a node is ...
math_noob's user avatar
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1 answer
184 views

Source Transformation on Dependent Current Source

I am facing issues while finding Vr3(V1) I have redrawn the circuit with circuit being open at current source I1 and have source transformed the dependent current source to a dependent voltage source ...
Anonymousstriker38596's user avatar
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1 answer
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Different results when using nodal and mesh analysis; application on a Thevenin equivalent problem [closed]

I need to find the Thevenin equivalent of the given circuit. The problem is that when I use Nodal analysis and mesh analysis I get different results. I know that Rth = 16 Ω. But when I use nodal ...
math_noob's user avatar
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2 answers
67 views

Why is my expression for current I(2) wrong?

simulate this circuit – Schematic created using CircuitLab Hi! My question is if I(2) is a current that runs from Node 1 to Node 2 then the expression of I(2) as a function of I(A), I(B), R1, R2 ...
DiodeLight97's user avatar
1 vote
2 answers
202 views

Conditions for a resistive circuit to have a solution

I am looking for (sufficient and/or necessary) conditions for a linear resistive circuit to have a solution. By "linear resistive circuit" I mean one which only contains ideal voltage and ...
kehagiat's user avatar
2 votes
1 answer
159 views

Current passing through voltage source using nodal analysis

I did a nodal analysis on this circuit where I put the reference node at the middle part. The question was to find the current passing through 10V source using nodal analysis. I tried answering it ...
mama b's user avatar
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Node voltage analysis

I just wanna ask if \$V_1\$ and \$V_3\$ could be -10V and -20V respectively in this circuit? I just thought of it because I assign the reference node in the middle, so that will be 0V. Because of the ...
mama b's user avatar
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1 vote
1 answer
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Voltage difference between two nodes surrounding a source [closed]

In the schematic you can see I have this circuit that includes a branch leading from ground to a 10Ω resistance, a 4V DC source and up to node A. I am trying to solve this circuit using the node ...
Lapi Gaming and more's user avatar
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1 answer
80 views

Nodal analysis: confusing solution

I encountered this problem in the book 'Fundamentals of Electric Circuits,' and I am confused about the approach that was used to solve it. This is the circuit and the solution of the book. Circuit: ...
spinachpizza_'s user avatar
6 votes
2 answers
297 views

Nodal analysis: negative answers vs book's positive solutions

I am practicing nodal analysis using the book "Fundamentals of Electric Circuits," and I have encountered two problems in which I obtained negative answers, whereas the book provides ...
user avatar
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1 answer
50 views

Node voltage method with dependent current source

Can anyone help me to solve this circuit using node voltage method? Because in the solution, I don't understand why there is just 3I1 only.
Jin En Ng's user avatar
1 vote
2 answers
258 views

Nodal Analysis with constraint equation

We were asked to form the node-voltage equations of this circuit. But how can I form the equation that specifies the constraint imposed by the controlled voltage source on the nodes it is connected ...
awit ka gHorl's user avatar
2 votes
1 answer
153 views

Getting different answers by Mesh and Nodal Analysis

simulate this circuit – Schematic created using CircuitLab Naming the top two loop currents clockwise as i1 and i2 and the bottom two as i3 and i4. By inspection, we can say $$i_1=-1A$$ Now, ...
Bruce Wayne's user avatar

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