Define a series circuit.

A series circuit is defined as one where all components are connected end-to-end in such a way that the same current flows through each component consecutively. This means that the total voltage provided by the power source is divided among the components, and each component experiences the same amount of current.

In a series circuit, if one component fails or is removed, the entire circuit is interrupted, halting the current flow for all components. This characteristic emphasizes the dependence of each component on the others in the circuit.

The other choices describe different characteristics: one refers to a parallel circuit where multiple paths exist for current to flow, another suggests a more general description of circuits concerning voltage sharing, and the last talks about varying voltage levels which are not specific to series circuits. Understanding these distinctions is crucial for grasping the fundamental principles of circuit design and operation.