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In the circuit shown, find the current through 4Ω resistor using Superposition theorem.

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In the circuit shown, find the current through 4Ω resistor using Superposition theorem.

(a) 4

(b) 5

(c) 6

(d) 7

I have been asked this question during an internship interview.

The above asked question is from Superposition Theorem topic in portion Useful Theorems in Circuit Analysis of Network Theory

1 Answer

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The correct option is (b) 5

To elaborate: Considering the voltage source 20V, 5A current source is open circuited.

Now current through 3Ω resistor is   20/(5+4)=2.22A.

Now considering the current source 5A, 20V voltage source is short circuited.

No current through 3Ω resistor is  5 × 5/(4+5)=2.78A. Now finally the current through 3Ω resistor is 2.22 + 2.78 = 5A.

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