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Find Vx due to the 3A source.

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Find Vx due to the 3A source.

(a) 56V

(b) 78V

(c) 38V

(d) 48V

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Asked question is from Superposition Theorem topic in portion Network Theorems of Basic Electrical Engineering

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Right choice is (d) 48V

The explanation: Due to the 3A source, we short the 16V and 10V source and open the 15A source. From the resulting circuit, we can use current divider to find the current in the 20 ohm branch and then multiply it with the resistance to find the voltage.

I20 = 3*80/(20+80)=2.4A

Vx=20*2.4=48V.

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