Network Analysis

Tutorial on Superposition - Part 3

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

Then you redraw the circuit with the two voltage sources removed; here's what you get:

The 150 W resistor is shorted out. I₁₂ can be found from the current divider equation:
I₁₂ = (12)(100)/(100 + 140) = 5 A

Let's move on to the final source.  Calculate the contribution of the 720 V source to I₀.  Assume that I₇₂₀ is in the same direction as I₀.

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