Define superposition theorem in circuit analysis.

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.