We observe from the examples on application of Superposition Theorem in Sect. 5.1 that the single-source circuits that need to be solved in that context may require us to use nodal analysis and mesh analysis often. However, we can expect to avoid these procedures in the case of circuits involving only resistors and independent sources. We will be able to solve the single-source circuits by employing series and parallel equivalents repeatedly. But, there is one pair of resistor connections that will not yield to this kind of approach. For instance, consider the problem of finding the current through the resistor R in circuit in Fig. 5.2-1(a) by applying superposition principle. The relevant single-source circuits ...

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