Question

Why thevenin theorem is not applicable for non-linear circuits ?

Answer 1

Thevenin's Theorem states that it is possible to simplify any linear circuit, no matter how complex, to an equivalent circuit with just a single voltage source and series resistance connected to a load. ... As such, we would call circuits containing these types of components, nonlinear circuits.

Answer 2

Answer:

The fact is that in the DC circuit we use Thevenin equivalent resistance, but in AC we have to find the equivalent Impedance. In the AC network, we have to use the phasor sum of the voltage sources. All other conditions are similar to the DC source. Thevenin's theorem cannot be applied to non-linear circuits.

Hope it helps you.