Using the reciprocity and superposition theorems simultaneously, determine the current I in the network of figure given below if a 5 V source acting alone can produce a current of 1 A in the resistor R.
When current of 1 A is produced, the given circuit can be represented as shown in Fig. (b).
By applying the homogeneity principle to Fig. (a), we get circuit shown in Fig. (c).
Applying reciprocity principle to Fig. (c), we get circuit shown in Fig. (d).
Interchanging the polarity, we get circuit shown in Fig. (e).
Figure (a) = Figure (b) + Figure (c) = 1 + 4 ≤ 5A.