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Hot answers tagged nodal-analysis

8 votes
Accepted

How to find the nodal voltage when there is a voltage source across two nodes?

I'd just rearrange the diagram and use source-splitting techniques: - From left to right, it's the same circuit but, breaking it down step by step is easier to analyse. Each step saves maths and is a ...
• 463k
8 votes

Can't find error in nodal analysis

I found out the drop voltage at $R$ which is -34. But the solutions say it is -28V. I can't find what did wrong. $$\color{red}{\text{Neither answer is correct }}$$ Think about it: How can the ...
• 463k
7 votes
Accepted

LTSpice outputting the incorrect voltage reading?

Make sure the direction of the current for F1 is oriented the way you want it. LTSpice follows the "passive sign convention" -- namely, the positive current direction through a current or ...
• 5,007
6 votes
Accepted

How can you tell what is the net direction of current flow when there are two opposing sources?

Redraw Schematics First Often, it helps a great deal to redraw a schematic. Not always. But sometimes the manual process of it helps you find an insight or two or, at least, develops a feel for things ...
• 78.3k
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 ...
• 3,497
6 votes
Accepted

Strange Nodal Analysis

Your mistake is again the current direction. For $V_1$ node you have wrote: $$+12A + \frac{V_1 - V_2}{2\Omega}....= 0$$ As we can see from a circuit diagram the $12A$ current is entering the node(...
• 14.9k
6 votes

• 78.3k
4 votes

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

why is it drawn like this Both the current direction arrow and the actual sign of the current need to be taken into account when establishing the true direction of current. Generally, the picture and ...
• 463k
3 votes

Where did this useful matrix decomposition come from for Nodal Analysis?

I'm no mathematician but I feel strongly this is related to the singular value decomposition (SVD) or eigendecomposition. I first came across SVD in the context of modelling MIMO communication ...
• 1,262

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