Question

12. Use nodal analysis to find \[v_P\] in the circuit shown in Fig. 4.38.

Answer 1

@agent0smith @wolfe8 @LastDayWork @ybarrap @broken_symmetry @douglaswinslowcooper

Answer 2

@Data_LG2

Answer 3

@TuringTest

Answer 4

I'm not familiar with nodal analysis, except that each node must have net zero coming into and leaving it. Usually a circuit as complex as this is analyzed using Kirchoff's rules and setting up little circuits within the big one.

Answer 5

Nodal analysis is the node rule.
Mesh analysis is the loop rule.

Answer 6

Thanks. Set up lots of node equations, then, I guess.

Answer 7

Sorry. Electronics is not really my thing... I love the practical aspect of it.

Answer 8

Green points are reference potential.
Write an equation for each node
Hence, we'll have 4 equations and 4 unknowns. Solve for V3

Answer 9

why are there three points for reference potential? are you referring to the circuit to be grounded? and in that case, isn't the entire bottom wire the same voltage?

Answer 10

The entire bottom wire is at the same potential; so I took it as reference. It's the potential difference that matters hence the answer will remain the same.

Answer 11

what i mean is, why did you draw three green points?

Answer 12

Just to make it look good :)

Answer 13

10 = v4/20 + (v4-43)/40

Answer 14

for the first on the left. do you agree to that?

Answer 15

@roadjester
For the node at potential v4
10 = v4/20 + (v4-v3)/40
is correct.

Answer 16

oh, oops, typed that wrong
hehe

Answer 17

Yea..I got that XD
Write the equations for the nodes at potential v3 , v3 and v1

Answer 18

gotcha; I'll call you (not literally mind you) if I get stuck
:)

Answer 19

:)