What is the physical meaning of negative value of "Thevenin" resistance? Sometimes in the calculations, a negative value of Thevenin resistance appears.
Negative resistance cannot physically occur in the case where the circuit is linear and contains only passive components (resistors, capacitors and inductors). But for active circuits - usually where amplifiers are applied - a virtual negative resistance can be realized.
The physical meaning of negative resistance is that power is absorbed by the circuit with zero phase shift - rather than dissipated.