# Node Analysis Question(Hard for me)

#### copala3

Joined May 31, 2019
12
I cannot solve this node analysis question. I think the circuit needs to be solved by redrawing it but I can't figure out how I can solve that method and how can I learn if I have a method like that. Sorry for english.This is google translation. Question:Find node voltages

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#### WBahn

Joined Mar 31, 2012
30,242
I cannot solve this node analysis question. I think the circuit needs to be solved by redrawing it but I can't figure out how I can solve that method and how can I learn if I have a method like that. Sorry for english.This is google translation. Question:Find node voltages
The problem isn't completely specified. You have a controlled voltage source but the controlling signal isn't shown. Please provide that information.

Remember that nodal analysis is nothing more than a formalized way of systematically applying Kirchhoff's Current Law.

Pick one node as your 0 V common. It can be any node, but the effort involved can depend on which node you pick. In this case, the left hand node is already shown as being your 0 V reference. You are free to change that and adjust later, but you might as well start with that.

For all other nodes, set up an equation that sums the current leaving that node in terms of the node voltages and the components between them and set that equal to zero.

Then solve for the node voltages.

Do your best to set up the equations for each node and post them and we can help you from there.

#### WBahn

Joined Mar 31, 2012
30,242
it is - and + pole not F
Ah! Thanks. That was going to be my next question.

#### copala3

Joined May 31, 2019
12
i phi current over 6 ohm resistor. Left to right.

#### Zeeus

Joined Apr 17, 2019
616
Read that book and you'll be smiling after

#### RBR1317

Joined Nov 13, 2010
715
I think the circuit needs to be solved by redrawing it
Redrawing is not necessary (other than drawing it clearly). I find it helps to colorize the nodes & supernodes before writing the node equations for all but the reference node. You also need to express the control current i-phi in terms of the node voltages.