Which type of circuit allows current to flow in only one path?

A series circuit is characterized by having a single path for current to flow. In this configuration, all components are connected end-to-end, meaning that the same current flows through each component sequentially. This arrangement is significant because if any part of the series circuit is interrupted, such as by a break or failure in one of the components, the entire current flow stops. This is in stark contrast to a parallel circuit, where multiple paths are available for current, allowing it to flow even if one path is disrupted. Understanding the structure of series circuits is crucial for predicting how changes in the circuit or faults in components will affect overall performance.