Norton’s theorem can be applied to ________.

The correct answer is option 4):(linear networks)

Concept:

• Norton's Theorem states that “Any linear circuit containing several energy sources and resistances can be replaced by a single constant current source in parallel with a single resistor “.
• In any linear, bidirectional circuit having more than one independent source, having more active and passive elements it can be replaced by a single equivalent current source I_N in parallel with an equivalent resistance R_N.

Where I_N = Norton or short circuit current

R_N = Norton's resistance

• Procedure in order to find Norton’s equivalent circuit, when only the sources of independent type are present.
• Consider the circuit diagram by opening the terminals with respect to which, Norton’s equivalent circuit is to be found.
• Find Norton’s current I_N by shorting the two opened terminals of the circuit.
• Find Norton’s resistance R_N across the open terminals of the circuit, eliminating the independent sources present in it. Norton’s resistance R_N will be the same as that of Thevenin’s resistance R_Th.
• Draw Norton’s equivalent circuit by connecting Norton’s current I_N in parallel with Norton’s resistance R_N.