Here's why:

* Single Path: In a series circuit, all components are connected in a single, continuous path.

* Flow of Charge: The flow of electrons (which constitutes current) has only one path to follow.

* Conservation of Charge: Since charge cannot be created or destroyed, the same amount of charge must pass through each component in the circuit.

Analogy: Imagine a single lane highway where all cars must follow the same path. The number of cars passing a point per hour (current) will be the same at any point along the highway.

Important Note: While the current is the same throughout a series circuit, the voltage across each component can vary depending on its resistance.