What is the minimum number of resistors needed to create a series-parallel circuit?

In a series-parallel circuit configuration, at least three resistors are required to create a meaningful relationship between series and parallel arrangements.

One resistor on its own cannot form a series-parallel configuration, as it lacks both components of the arrangement. With two resistors, you can create a simple series or parallel circuit, but it still does not encompass the characteristics of a series-parallel circuit, which requires a combination of both arrangements.

However, introducing a third resistor allows you to set up a configuration where some resistors are in series with one another, while others can be set in parallel with that arrangement or among themselves. This combination effectively demonstrates the principles of a series-parallel circuit, making it the minimum number required to achieve that particular circuit type.