What type of circuit is used for a single path along which electricity flows?

The correct answer is a series circuit. In a series circuit, components are connected end-to-end along a single pathway. This means that the electric current flows in one continuous loop, allowing it to pass through each component sequentially. If one component in a series circuit fails or is disconnected, the entire circuit is interrupted, and current ceases to flow.

In contrast, a parallel circuit allows for multiple pathways for electricity to flow. This means that even if one path is broken, current can still flow through the other paths. Complex circuits include both series and parallel components but are not defined as having a single path for current. A closed circuit refers to a complete circuit without any breaks, enabling current flow, but does not specify whether it is a series or parallel configuration. Thus, a series circuit is fundamentally characterized by having only one path for electricity to flow.