State and explain superposition theorem.

State and explain superposition theorem.
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1 Answer

Answer :

Superposition theorem states that: In a linear circuit with several sources the voltage and current responses in any branch is the algebraic sum of the voltage and current responses due to each source acting independently with all other sources replaced by their internal impedance.

Steps to solve a circuit with the help of Superposition theorem:

1. First of all make sure the circuit is a linear circuit; or a circuit where Ohm’s law implies, because Superposition theorem is applicable only to linear circuits and responses.

2. Replacing a Voltage source or Current Source replace with their internal resistance or impedance. If the Source is an Ideal source or internal impedance is not given then replace a Voltage source with a short; And replace a Current source with an Open.

3. Determine the branch responses or voltage drop and current on every branches simply by using KCL , KVL or Ohm’s Law.

Repeat step 2 and 3 for every source the circuit has.

Now algebraically add the responses due to each source on a branch to find the response on the branch due to the combined effect of all the sources.
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