Network Analysis

Tutorial on Superposition - Part 4

That's right.  You start from the original circuit.

Then you redraw the circuit with the 480 V source and the 12 A source removed; here's what you get:

The mesh current equation for the mesh on the left can then be written.
-720 = 100I₇₂₀ + 140I₇₂₀
I₇₂₀ = -720/(100 + 140) = -720/240 = -3 A

Let's review our findings:
Contribution to I₀ from the 480 V source = I₄₈₀ = 2 A
Contribution to I₀ from the 12 A source = I₁₂ = 5 A
Contribution to I₀ from the 720 V source = I₇₂₀ = -3 A

Now calculate I₀.

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