Norton's Theorem states that a linear two terminal circuit can be replaced by an equivalent circuit consisting of a current source In in parallel with a resistor Rn where In is the short circuit current through the terminals and Rn is the input or equivalent resistance at the terminals when the independent sources are turned off.
the process of finding Rn is the same way on finding Rth by the use of source transformantion, thevenins and norton's resistances are equal:
Rn=Rth
To find the norton current In, we determine the short circuit current flowing from the terminal a to b in both circuit. It is evident that the short circuit current is In. It must be the same short circuit current from terminal a to b. since the two circuits are equivalent.
In=isc
In=Vth/Rth
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