ECN | State ‘Norton’s’ Theorem for AC circuit.

 Norton’s Theorem:

It states that any linear, active network containing one or more voltage and/or current source can be replaced by an equivalent circuit containing a single current source and equivalent impedance across the current source.  

The equivalent current source (Norton’s current source)  is the current through the short circuited terminals of the load. The equivalent impedance is the impedance seen between the load terminals while looking back into the network with the load removed and internal sources replaced by their internal resistances.