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Define superposition theorem in circuit analysis.

1 Answer

The Superposition Theorem is a fundamental principle used in electrical circuit analysis to simplify the analysis of complex circuits with multiple sources by breaking down the analysis into individual source contributions. It states that in a linear circuit containing multiple independent sources, the response (current or voltage) at any point in the circuit is equal to the algebraic sum of the responses produced by each independent source acting alone while all other sources are turned off.

In other words, when using the Superposition Theorem to analyze a circuit, you analyze the circuit multiple times, considering only one source at a time while "turning off" (replacing with a short circuit for voltage sources or an open circuit for current sources) all other independent sources. Then, you calculate the desired voltage or current for each source separately. Finally, you add up the individual results to obtain the total response for the circuit.

The Superposition Theorem can be a helpful tool in analyzing circuits with multiple sources, as it allows the circuit analysis to be broken down into simpler steps. However, it is important to note that this theorem is applicable only to linear circuits – circuits where the relationship between current and voltage follows Ohm's law, and elements do not change their characteristics with voltage or current.
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