In which type of circuit is the current always the same through all components?

A series circuit is defined by having only a single path for electrons to flow from the power source, through the components, and back again. Because there are no alternate routes or branches, the entire flow of electricity must travel through every component in the chain. As a result of this single path, the current (measured in amperes) remains exactly the same at any point in a series circuit. If 2 amperes flow out of the battery, 2 amperes must flow through each resistor and wire in that loop. In contrast, a parallel circuit has multiple paths, allowing the total current to divide and flow differently through each branch. Therefore, current is not guaranteed to be the same across all components in parallel or branched circuits.