A __________ circuit is one in which there is only one path for current to travel.

A series circuit is defined by having a single path through which electric current flows. In this type of circuit, when components like resistors, light bulbs, or other devices are connected end-to-end along a single route, the same current travels through each component. This characteristic means that if one component fails or is removed, the entire circuit is interrupted and the flow of current stops.

The concept contrasts with other circuit types. For example, a parallel circuit offers multiple paths for current to travel, so if one path is broken, current can still flow through others. Understanding series circuits is fundamental because they are often used in simple applications such as string lights or basic battery circuits, where the operation relies on the sequential connection of components.