In which type of circuit do components share the same voltage?

In a parallel circuit, all components are connected across the same two nodes, which means that each component experiences the same voltage across it. This is a fundamental characteristic of parallel circuits. When a voltage source is applied, the voltage remains consistent throughout every branch of the circuit, regardless of the number of components or their individual resistances. As a result, if you measure the voltage across any component in a parallel arrangement, it will be the same as the voltage supplied by the source.

This unique trait of parallel circuits allows them to function independently; if one component fails or is removed, the others remain operational because each is still connected directly to the voltage source. In contrast, series circuits have components connected end-to-end, which results in the same current flowing through each, but the voltage across each component may vary based on its resistance.

Complex circuits can involve both series and parallel components, but they do not inherently share the same voltage throughout. Alternating circuits pertain to the type of current and voltage that change direction over time, but this does not specify the relationship between components in terms of voltage sharing.

Thus, parallel circuits are the correct answer because they ensure that all components receive the same voltage from the source.