Applicability of superposition: The superposition theorem is primarily useful for single-source circuits. True or false?

Introduction / Context:
The superposition theorem is a linear-circuit tool used to analyze the combined effect of multiple independent sources by summing individual contributions. Understanding when it helps is essential for efficient problem solving.

Given Data / Assumptions:

• We consider linear circuits (R, L, C, linear dependent sources).
• Superposition applies to voltages and currents but not directly to powers (since power is nonlinear in V and I).
• Independent sources may be voltage or current sources at different locations or frequencies.

Concept / Approach:

Superposition shines in multi-source circuits: deactivate all but one independent source at a time (voltage sources → short; current sources → open), compute the response, then sum all contributions. In a single-source circuit, superposition offers no advantage; there is only one contribution to compute, so the theorem is trivially satisfied but not particularly useful.

Step-by-Step Solution:

Verification / Alternative check:

Compare with nodal or mesh analysis. For many sources, superposition can simplify algebra by reusing partial solutions, confirming its utility specifically in multi-source scenarios.

Why Other Options Are Wrong:

• “True” incorrectly suggests superposition is best for single-source circuits, where it is unnecessary.

Common Pitfalls:

Incorrectly “turning off” dependent sources. Dependent sources remain active because their values depend on circuit variables. Also, attempting to superimpose power directly leads to errors.

Final Answer:

False