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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Nodal analysis using matrices - Wrong math?

I am attempting to solve a (not so difficult) circuit using nodal analysis However I am getting 0V for half of my nodes, which is clearly wrong, the results violate KCL Method I am using nodal ...
58 views

3x3 nodal analysis. I know v2 but I don't know how I can use v2 to find v1 and v3

I tried KCL but I don't know what to do from there. I hope someone can show me how to do it. This is how I figured out v2 is 12 V.
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Finding Thevenin voltage and resistance [closed]

I am struggling to find the Thevenin voltage and resistance across terminals A and B of the given circuit. I got as far as writing KCL at nodes 2 and 3, which gave this: v_\text{AB} = - G_2/G_1 e + ...
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How to model MOSFET in a continuous manner in circuit simulator with Early effect?

I'm implementing a power electronics circuit simulator. Currently I have all linear components including capacitors/inductors/transformers, switches, and as the only nonlinear component Shockley diode....
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227 views

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?
87 views

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 = ...
68 views

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 ...
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691 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 ...
167 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 ...
218 views

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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1 vote
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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 ...
85 views

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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1 vote
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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 ...
81 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 ...
318 views

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 ...
227 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 ...
147 views

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 ...
68 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 ...
1 vote
209 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 ...
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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 ...
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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 ...
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1 vote