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## Summary:

- About the conditions to be met for the applicability of substitution theorem in circuit theory

Hi,

I've a doubt about the applicability of the substitution theorem in circuit theory.

Consider the following picture (sorry for the Italian inside it )

As far I can understand the substitution theorem can be applied to a given one-port element attached to a port (a port consists of two terminal that meets the condition: currents flowing into the two terminals are equal and opposite) when the following holds:

Does it make sense ?

I've a doubt about the applicability of the substitution theorem in circuit theory.

Consider the following picture (sorry for the Italian inside it )

As far I can understand the substitution theorem can be applied to a given one-port element attached to a port (a port consists of two terminal that meets the condition: currents flowing into the two terminals are equal and opposite) when the following holds:

- the starting network has
*at least*one solution for the current/voltage of each graph link (one-port element) - the network obtained by replacing a given one-port with an independent generator having exactly the same port current (voltage) has an
*unique*solution

Does it make sense ?