# Questions tagged [nodal-analysis]

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### 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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### 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 ...
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} ... 2answers 143 views ### 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'... 1answer 57 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 ... 3answers 88 views ### 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 ... 0answers 111 views ### 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 ... 1answer 74 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 ... 1answer 37 views ### 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 ... 1answer 32 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. 0answers 22 views ### Find the power supplied by the 1V source in the circuit using nodal analysis My attempt: At node 1 > 4 = 6 + I1 Node 2 > I1 + I3 = I 2 Node 3 > 6 = I 3 + I 4 I1 = (V1 - 4)/21 In node 1, Using the equation for I1, V1 = -38V. I2 = (V1 - 4 - 1)/2 So, I2 = -21.5A Power ... 2answers 57 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 = (... 2answers 74 views ### 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$is the ... 2answers 113 views ### Thevenin's Theorem: Why is there a$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 ... 1answer 44 views ### 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 ... 2answers 60 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 ... 1answer 68 views ### Node analysis with voltage source in matrix form simulate this circuit – Schematic created using CircuitLab Can you please check if my reasoning is correct? The sum of currents leaving node k is:  I_k = \sum_{i = 0}^{n} I_{ki} = \sum_{i = ... 1answer 250 views ### Intuition on Thevenin's Theorem In the following lecture by Prof. Anant Agarwal at 36:00, he intuitively proves Thevenin's Theorem using the following circuit simulate this circuit – Schematic created using CircuitLab If ... 1answer 74 views ### Solving a circuit with Nodal Analysis [closed] I've been trying to start solving the circuit for a long time now, but I've no idea where to begin, what node should be grounded. Someone please solve this circuit ina detailed manner 1answer 68 views ### Mesh Analysis has failed to solve this circuit I built the following circuit in LTSpice and found each mesh currents to be (which also matches the answer sheet provided by my professor): i1: 9A i2: 8A i3: 11A i4: -6A However, I am unable ... 3answers 262 views ### Nodal analysis -> transfer function -> step response I've been trying to get the transfer function for the circuit in the image below, but I seem to be doing something wrong, since the simulation on Circuitlab gives me a different Bode plot and I can't ... 0answers 51 views ### Actual direction of phasor current - Power Calculation I am trying to calculate the complex power in this circuit. I used nodal analysis to find Vc, and the voltage at the top of the 2H inductor (=3.13<177.8 V_RMS). I did the math for all elements in ... 2answers 492 views ### Nodal analysis using supernode tough problem Hi I am stuck on the following problem: I know I have to use a supernode but I dont know where to put it. 2answers 61 views ### Nodal question with current-controlled voltage source connected to independent voltage source so i've got a question here the question is to calculate v1 & iΦ, of course for nodal analysis (v1/24) + ((v1-(60+6iΦ))/3) + ((v1-va)/2) = 0, but (with va as the node left of 2 ohm resistor) how ... 3answers 623 views ### What is the value of the current (i) and what is the right way to do it? [duplicate] What exactly went wrong with the below method? Here, in the same circuit I am getting a different value for the current in the mid wire only by rearranging the circuit. I was trying to solve this ... 1answer 128 views ### Nodal analysis in s-domain help I am learning circuit analysis in s-domain from my textbook "Engineering Circuit Analysis by William Hayt, 8th Ed". I am struggling with the mesh and nodal analysis. In the book at page 583, there is ... 1answer 153 views ### What's wrong with this Wheatstone bridge? I was trying to solve this unbalanced Wheatstone bridge and found that the current i in the mid wire is 9A .This result was achieved by using node voltage method. Then I rearranged the same circuit ... 0answers 46 views ### For given circuit, does the current “io” through the branch equal zero after short circuit ? [2-port network] The circuit is; simulate this circuit – Schematic created using CircuitLab For given 2 port network, Im shorting V1 to solve for y22 and y12 and apply a current source at V2.[Y-Parameters] ... 0answers 57 views ### Determine Y-parameters for given circuit. [Used Nodal Analysis] I am trying to solve this circuit for past 3 hours, no success, so I am posting here. simulate this circuit – Schematic created using CircuitLab I used nodal analysis, I will go over the ... 1answer 84 views ### Measuring the effect of a resistor In an idealized model, the voltage at node1 is the same as the voltage at node2. However, in reality waves take time to travel and the voltage at node1 will not be identical to the voltage at node2. I ... 1answer 526 views ### Doing nodal analysis on a circuit with a capacitor. I'm looking at with the switch open. I get While going through the nodal analysis I get V1 = 3V Does that mean current across the resistor would then just be 1mA? 1answer 77 views ### How to find the transfer function F(w) for this circuit? [duplicate] Hi, My book on analogue circuits has this question and I have been stuck at it for the past three days or so. I am supposed to figure out the transfer function for the network as well as the cutoff ... 4answers 178 views ### Basic nodal analysis question I have a question about node analysis method. The part I could not solve is the Node c's equation. In equations, C is represented by 3.Here is my question what is G5(i=GV) in the circuit. The empty ... 1answer 97 views ### How to solve a circuit network involving a resistor parallel to a voltage source using only nodal analysis? I have been stuck on this for the past week and this week i just dont seem to find out what am i doing wrong. Please help me spot my mistake. Here you can find My circuit on multisim. Please provide ... 1answer 125 views ### Nodal Analysis & Identifying Nodes What is a Node? In electrical engineering, a node is any point on a circuit where the terminals of two or more circuit elements meet. An image from my textbook... Why is the node rightward of ... 1answer 68 views ### Writing the Nodal and Mesh equations for large circuit and large supermesh Here's my circuit: simulate this circuit – Schematic created using CircuitLab I have defined the node 'voltages' and the mesh current directions and the currents themselves. What I want to do ... 1answer 63 views ### Opamp confusion I would really appreciate a little help here if someone explain me why his Voltage is 4v while mine is 10/3 and one more thing: whats the point of Applying KCL at node 1 when 5v is already known at ... 1answer 61 views ### Finding current over controllable voltage source using nodal analysis I have the following circuit: Let me explain the diagram a bit first: I0 is current in that direction, V0 is voltage and 2 V0 is also voltage times two. V1, V2, and V3 are my nodes. The 'S' by the ... 2answers 73 views ### How do I calculate I2 by nodal analysis only? I am trying to do a nodal analysis of this circuit. and I need to do this by nodal analysis only. I need to find$ i_1 $,$ i_2 $and$ i_3 $. I have found that$ i_1 = \frac{V_B - V_A}{R_1}...
I have this circuit and I know that for $V_1$ (taking current exiting the node as positive) it is $\frac{-(8-V_1)}{2} +\frac{V_1}{4}-\frac{V_2-V_1}{1} -4=0$ but for $V_2$ I'm slightly confused. ...