Reciprocity Theorem: This theorem is applicable to only linear, passive and bilateral networks, that is, the network with R, L, C, so the network with RLC is called reciprocal network
Reciprocity Theorem
Defenition
In a linear, passive and bilateral networks, the ratio of response to the excitation is always constant; even if
the sources are interchanged from input to the output terminals .

Receiprocity condition with sources interchanged for input to output terminals.

Note:
- This theorem is applicable to only linear, passive and bilateral networks, that is, the network with R, L, C
so the network with RLC is called reciprocal network. - The presence of the controlled sources in the network makes it linear, active and bilateral. Hence, reciprocity theorem is not applicable. So, these networks are called non-reciprocal networks.
Problem: Question 1
Q : The network shown in the following figure is a linear passive and bilateral network. Use the data given in Fig. (a) and apply the principle of reciprocity and superposition to determine current ix
in Fig. (b).

Solution
Solution: By applying the homogeneity property to Fig. (a), we get circuit given in Fig. (c).

On applying reciprocity property to Fig. (c), we get circuit in Fig. (d).

Fig. (b) = Fig. (c) + Fig. (d)
ix1= i x1 + ix2
= 8−4 = 4 A
Question 2:
Determine the value of ix in the given circuits.

Solution
Solution: By applying homogenity property to Fig. (c) in Problem 2, we get Fig. (e).

Figure (b) = Figure (f) + Figure (d) = ix
= −24 − 4
= −28 A
Electrical Circuit Theorems
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