The superposition theorem states that in a linear circuit containing multiple independent sources, the effect of each source is considered separately while the other independent voltage sources are replaced by short circuits and independent current sources by open circuits. The individual responses are then algebraically combined.
In applying the superposition theorem, the sources are considered one at a time with all others replaced by their internal impedance.
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Question context
This question is part of ⚡ Electrical Engineering within the broader 🛠️ Engineering Essentials subject and appears in the PTS Pakistan Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.