Voltage Source Short Circuited And Current Source Is Open Circuited When They Are Removed From The Circuit While Solving Problem Based On Superposition Theorem.Lets see how and why this happen :

### Voltage Source With Dummy Element

In superposition theorem, linear network containing two or more sources, the response in any element is equal to the algebraic sum of the responses caused by individual sources acting alone, while the other sources arc non-operative, i.e. while considering the effect of individual sources, other ideal voltage sources and ideal current sources in the network are replaced by short circuit and open circuit across their terminals.

The voltage source is always short circuit. The voltage source always in series with the resistance (not in parallel because we know the voltage across it). The ideal voltage source have zero internal resistance. Thus, the voltage source should be short circuited.

### Current Source With Dummy Element

The current source is always in parallel with the resistance (not in series because we know the current through the resistance called dummy element). The ideal current source have infinite internal resistance thus current source should be open circuited. If such conditions are not applied we cannot solve the problem based on superposition theorem.

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