Discussion
What is the purpose of Norton's theorem ?
Answer: A
The key's answer is simplify parallel circuits.
Norton's theorem replaces any linear two-terminal network, however complex, by a single current source \(I_{N}\) in parallel with a single resistance \(R_{N}\). Because the equivalent is a parallel combination, the load can simply be added in parallel and the load current found with the current-divider rule, which makes parallel circuits and parallel loads easy to analyse.
Calculating the equivalent resistance is only one step in finding the Norton equivalent, not its purpose. Determining the open-circuit voltage is the corresponding step of Thevenin's theorem. The theorem applies to DC and AC linear circuits alike, so 'analyse AC circuits' does not describe its purpose.
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