Node Voltage Method Circuit Analysis With Current Sources

This electronics video tutorial provides a basic introduction into the node voltage method of analyzing circuits. It contains circuits with voltage and current sources. It explains how to determine every current in a resistor as well as the electric potential of all nodal points in the circuit.
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[@TheOrganicChemistryTutor]

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HELP but 4vb=2vc-80 no?
And 80 - 2vc - 11vc = 100 13vc=180 right?
Edit: forgot to say 26:00

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I absolutely love his videos, and this is well done, but he does it a bit differently then what we are being taught, and I do not like it as much, we do it so at each node that we are looking at, we assume current is flowing away in all directions, even though it may be obvious that it isn't right because its more important to stay consistent, and everything should work out in the end.

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[@175griffin]

Rather than going through all the trouble of trying to guess the correct direction of current in a node branch, just pick one. If the current goes the other way, it'll just give you a negative value. Flip the sign, flip the arrow.

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i just tried what you said and it was way easier and quicker! but im more prone to making mistakes this way compared to his method so pick and choose i guess

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He is the teacher of course he knows we can pick any direction but breaking it down like split the circuit in half is really cool way to analyze which side has more potential.

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You do not have to try and find out the direction of current. You can make up your own direction from the get go as long as you are consistent.
In KVL you choose counterclockwise or clockwise for all loops and remain consistent. In KCL you choose all currents to leave a node or all currents to go into a node and you will get the right answer.
Think of it like scaling an equation by a constant of -1 depending on which convention you choose. You will get the same value when solving. Trying to find the direction of every current is inefficient and will lead to errors if you are not careful. After you find the node voltages you can find any current for any given direction with simple Ohms law.This video was more standard KCL than node voltage. Node voltage is supposed to make KCL even easier by choosing one defined direction. You are less likely to miss signs doing it this way.

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i found this really helpful although i used KCL(Kirchhoff's current law) to find the voltage at the end. which i find easier but is the same thing I guess