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14 votes
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What is the voltage drop across the 10 ohm resistor?

Millman's theorem is a kind of multi source voltage divider theorem based on this topology: - So, re-arrange your circuit to use a 3rd source that is actually 0 volts and you're good to go: - Hence \...
Andy aka's user avatar
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8 votes

What is the voltage drop across the 10 ohm resistor?

Two voltage sources are contributing towards the voltage drop across V1. So the equation \$V_1 = (20 .10)/(10+4)\$ is not correct. You ignored the 10V Source, and the 10 ohm-5 ohm resistor network in ...
Mitu Raj's user avatar
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6 votes
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Simple circuit, mesh method, can't resolve

Your schematic and the current directions I chose to take in my own head: simulate this circuit – Schematic created using CircuitLab I get the same equations you do. My work is on the left, ...
jonk's user avatar
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6 votes

What is the voltage drop across the 10 ohm resistor?

You can solve this with either mesh or node analysis. Here's my take on the problem using mesh analysis: Let’s call the left mesh Mesh I and the mesh on the right, Mesh II. There is a current i1 ...
AW Exchanger's user avatar
6 votes
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RC Circuit Analysis Direction Changes Formula

The basic constitutive equation for a capacitor is based on these assumed polarities, The equation being, $$i(t)=C\frac{dv}{dt}$$ If you want to define your current as leaving the capacitor then you ...
relayman357's user avatar
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6 votes
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How did the authors arrive at the answer?

I get the following four equations: $$\begin{align*} 0\:\text{V}+24\:\text{V}-5\:\Omega\cdot\left(I_1-I_3\right)-V_{4\text{A}}-3\:\Omega\cdot 4\:\text{A}&=0\:\text{A} \\\\ 0\:\text{V}+3\:\Omega\...
jonk's user avatar
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6 votes

Determine Thevenin's equivalent circuit

Step by step. Don't need text but rules say 30 char.
stretch's user avatar
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5 votes

Simple circuit, mesh method, can't resolve

If you want to try here is the circuit: Firstly, try and look at things as an EE would. For instance I could convert your diagram like this: - Note that mentally I've named a node as 0 volts because ...
Andy aka's user avatar
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5 votes

What is the voltage drop across the 10 ohm resistor?

OK I got my initial calculation wrong but here's the source transformation method (answer now deleted because I was too hasty with my calculations). I've decided to undelete it because there is an ...
Andy aka's user avatar
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5 votes

Determine Thevenin's equivalent circuit

Can anyone tell me what the right answer is/ where I have gone wrong. Here's where your error is: -
Andy aka's user avatar
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5 votes
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What is a mesh, and why not instead use independent loops for mesh analysis?

Some of what I'll discuss is drawn from GRAPH THEORY AND ITS ENGINEERING APPLICATIONS by Wai-Kai Chen then at the University of Illinois, Chicago, and published in the Advanced Series in Electrical ...
periblepsis's user avatar
4 votes

What is the voltage drop across the 10 ohm resistor?

Let me give another approach, maybe simplistic. There are several theorems or methods, but let's not forget that all those theorems come from the observation, someone found a pattern and proved its ...
Eloy Calatrava's user avatar
4 votes
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How to use nodal or mesh analysis with a current source?

My problem here is how current source works. The beauty of source transformation If I redrew your original circuit like this: - Would you find it easier to solve? Would you know what to do next to ...
Andy aka's user avatar
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4 votes
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Source transformation brings out a different result compared to other methods

In the first figure, there is one node between V1 and R2 that is connected to another element in the circuit. In such conditions, the source transformation is not applicable, the circuit in the second ...
staneal's user avatar
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4 votes
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Circuit analysis (Current intensity)

The problem is that I can't even check if my answers are correct when doing a exercise. Is there any tool on internet that calculates such things ? Yes, any SPICE-like simulator can solve this ...
The Photon's user avatar
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4 votes

Determine Thevenin's equivalent circuit

You understood that you considered a series connection of the resistors rather than a parallel connection for \$R_{th}\$. When you have a resistance across measurement terminals - your 2-ohm ...
Verbal Kint's user avatar
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4 votes

What is a mesh, and why not instead use independent loops for mesh analysis?

You are absolutely correct about being able to shuffle nodes around to reveal alternative "meshes", and doing so does not alter the solution. The resulting equations will appear different, ...
Simon Fitch's user avatar
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3 votes
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Writing the Nodal and Mesh equations for large circuit and large supermesh

For a supermesh enclosing both current sources you need to come up with three equations. One equation will be a KVL equation around a loop that encloses \$I_A\$ and \$I_B\$. I see only one loop that ...
Elliot Alderson's user avatar
3 votes

Mesh analysis equations with dependent current sources

It helps to redraw the schematic, a little, and to include some other unknowns in the schematic. simulate this circuit – Schematic created using CircuitLab One of the things that earlier ...
jonk's user avatar
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3 votes

Determine Thevenin's equivalent circuit

I provided my approach in a short comment shortly after Andy's answer. And while I don't disagree with Andy, the additional two answers I see now elaborate similar approaches. However, I'm annoyed by ...
jonk's user avatar
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3 votes

Help Solve a Circuit Using Mesh Current Analysis

Quick summary of your problem statement First off, here's a labeled schematic drawn up in LTspice (free from Linear Tech): I placed a ground at the intersection, since that's where I decided to start ...
jonk's user avatar
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3 votes

Analysis of circuit with dependent voltage source with no apparent solution

Adapting your diagram, here's how I'd plan out the mesh analysis: $$\begin{align*} 0\:\text{V} + V_1 -\left(I_1-I_3\right)R_2 - I_1 \,R_1 &= 0\:\text{V} \\\\ 0\:\text{V} - I_2 \,R_4 -\left(I_2-...
jonk's user avatar
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3 votes

What is an electrical node?

In electrical systems, a voltage node is a region where the voltage is the same throughout the region. A current node, is also a voltage node, where current branches combine or merge. There can be ...
RussellH's user avatar
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3 votes

Why is the current flowing this way in these 2 meshes in a simple circuit?

The currents do not necessarily flow in directions as depicted. The positive flow direction is set for sake of notation and you do the calculations based on the equations and the selected direction of ...
Justme's user avatar
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3 votes
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Incorrect current assumed in Hayt Ex 5.3

The relationship between the dependent voltage source and the current must be maintained. If you swap the arrow direction for the current \$i_x\$ you also have to swap the sign on the dependent ...
Spehro Pefhany's user avatar
3 votes

How many meshes are in this circuit?

This is likely drawn improperly. Or it's intended to trick you. For example, the 80k resistor reduces to a short circuit. As does the 2A source. But you could argue the short that it forms with itself ...
MOSFET's user avatar
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3 votes
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Why does each mesh equation give different I3 value? What's the correct value and final answer?

You have three loops showing. (There are other loop arrangements that could be used to replace any of those three, just FYI.) Two of the loop currents are known because there are current sources that ...
periblepsis's user avatar
2 votes

Using mesh analysis to get the transfer function of electrical system

To determine transfer functions in a swift and efficient manner, the fast analytical circuits techniques or FACTs are an invaluable tool to learn. The basic principle is to determine the time ...
Verbal Kint's user avatar
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2 votes
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Using mesh analysis to get the transfer function of electrical system

But as I remember, the both currents I1 and I2 are in the same directions, so it should + instead of - ? If you look at the total current through the inductor, then you see that \$I_1(s)\$ goes from ...
Sven B's user avatar
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