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Homework Statement
For some reason I don't use this theorem since Thevenin's theorem is more common. I'm asked to find the Norton equivalent source between the terminals ##A## and ##B## for the following:
Homework Equations
The Attempt at a Solution
The first step is to short ##R_2##, and to find the short circuit current across that wiring.
I believe KCL at the node above the ##3 mA## would be useful:
##\sum I = 0 \Rightarrow 3mA + I_{sc} - I_R = 0 \Rightarrow I_{sc} = I_R - 3mA = \frac{V_{Node} + 20V}{4k} - 3mA##
Now ##V_{Node}## is the voltage across the ##3 mA##. Applying KVL around the left loop using the current source as a constraint:
##\sum V = 0 \Rightarrow 20V + V_R + V_{Node} = 0 \Rightarrow V_{Node} = -(20V + V_R) = -(20V + (3mA)(4k)) = - 32V##
This implies that ##I_{sc} = \frac{-32V + 20V}{4k} - 3mA = - 6mA##.
Is this reasonable?