Which of the following is a fundamental character of a series circuit?

In a series circuit, one of the key characteristics is that all components are connected end-to-end, forming a single path for current to flow. This means that if one component fails or is removed, the entire circuit is interrupted and stops functioning, which aligns with the idea of not being parallel. In contrast, parallel circuits consist of multiple pathways for current, allowing it to flow through several branches simultaneously, which is not a feature of series circuits.

The concept of low resistance and high voltage can vary based on the specific components and power sources used in the circuit; these attributes are not fundamental characteristics defining a series arrangement. While a series circuit can have low resistance depending on the components, it is not a defining feature like the single pathway characteristic. Thus, the definition of a series circuit hinges on the fact that it is not parallel, making that aspect central to its understanding.