According to the reciprocity theorem, the current flowing through a circuit due to a voltage at a second point is the same as the current flowing through the circuit due to the same voltage at the first point. For practically all passive networks, the reciprocity theorem holds true.
First, choose the branches with which reciprocity must be created.
Using any standard network analysis approach, determine the current in the branch.
The voltage source is switched between the selected branch and the other.
This theorem is used to investigate Ultrasound produced by Elastic Bodies with High-Intensity Surface Heating. On an inhomogeneous transversely isotropic half-space, this theorem is used to determine line-load-generated surface waves.
Every complex reciprocal passive network, on the other hand, may be reduced to a simple network. In a linear passive network, supply voltage V and output current I are mutually transferable, according to the reciprocity theorem. The transfer resistance is defined as the ratio of V and I.