A particularly important ramification of the property of linearity is expressed in the notion of equivalent circuits. To wit: if we are considering the response of a network at any given terminal pair, that is a pair of nodes that have been brought out to the outside world, it follows from the properties oflinearitythat,ifthe networkislinear,the output at a singleterminalpair(either voltage or current) is the sum of two components:
1.
The response that would exist if the excitation at the terminal pair were zero and
2.
The response forced at the terminal pair by the exciting voltage or cur

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please explain these two points...@LonelyandForgotten

@stgreen could you help me..i cant get these points..

yea it makes sense...its about natural and step response of circuits

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