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when we are trying to model a none-ideal voltage source or current source, we may need to put some resistors, I guess that is what you are asking.
for voltage source, we want it to have 0 output impedence so no matter how big the loading is, its output voltage remains the same, however realistic voltage source can not do it, to put a small resistor in serial with ideal voltage source can model such a case.
same thing happens for current source, we expect an ideal current source has infinit output resistance, but to model a practical one, we can put a big resistor in parrelle with an ideal current source to represent it.
I think you r little bit confused about the model of the actual voltage and current source.
The resistance that is in series with a voltage source represents the internal resistance of a voltage source. For an example think about a battry(a AA size ... ;-) ). I think you have had experiance that the increasing of the current drawing from the battry decreases the treminal voltage. Think about using V = iR.
We can get the maximum output power by connecting a resistive load which is equal to the value of the internal resistance.
For a current source this could be explained in the same way.
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