Nodal Analysis Example Problem #2: Two Current Sources

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This tutorial works through another Nodal Analysis example problem. Nodal Analysis is a method of circuit analysis where we basically just apply Kirchhoff's Current Law (KCL) at each node with an unknown voltage. You can choose to ground any of the nodes, but generally, grounding one with the most branches (especially if they are voltage sources) will make the problem easier. We will end up with one equation per unknown node voltage, and can just solve the system of linear equations to find the branch currents. This example problem features two current sources.

This video is part of a full free course on electric circuits. The course covers DC circuits, circuit laws, current & voltage sources, series & parallel resistors, nodal analysis, mesh analysis, and AC circuits.

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Thanks for watching, I hope it helps!

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Scroll up and hit that 👍 button if you found this video helpful!

EngineerFree

I love the way you color coded the nodes, very helpful! Thanks

rigelwachtmann

Taught this to me in one night. You are amazing. Thank you!

gooniloon

Thank you so much for this Chanel! I will make use of these videos this semester 😁

DjFlowkiiD

Sir i hated electrical science, but you are teaching in such a way that i have started loving it, THANK U SIR, THANKS FROM INDIA

dailydhamaka

absolutely hate my network theory professor, this video helps alot

shawrhit

Great video :) A future video on supernodes before covering mesh analysis would be helpful

guillaume

How do we know that the color coded nodes are taken as the same node? I am so very confused

biancaar

@ 7:31 "And we can see here I_3 has to be switched..."
DON'T EVER DO THAT! The current values you obtain are consistent with directions of current flow assumed in your diagram in the first place. If any of them are negative then that just means they actually flow in opposite direction than what you assumed. But don't change you diagram. To do so introduces a possible source of error for future calculations. In the meantime, you're engineers. You're supposed to be able to figure out what a minus sign means.

johnnolen

thank you very much, you made everything clear.

arkadiuszniedziela

How do u determine and identify the three nodes in the first place? The rest was very well explained. Thanks!

fayadkhan

how did it become 5.38, 3.94, and 3.69? can you care to explain?

MARTINAARICGO

Thank you so much sir for this information

Mythicworld-po

Are matrices always better for solving for the voltages at the nodes or are simultaneous equations ok? I know they are basically the same thing but i just thought it worth asking

emmetralph