# 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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### How does Kirchoff's current law work for sinusoidal voltage sources?

I was solving a steady state question with sinusoidal AC voltage source and the solution for the question used Kirchoff's current law to find the nodal voltage of a node. Now, I used to think that I ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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’...
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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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