In a series circuit, which value remains constant throughout?

In a series circuit, the current is the value that remains constant throughout all components of the circuit. This is due to the nature of series connections, where the same amount of current flows through each component sequentially without branching off. In other words, every component experiences the same current because there are no alternative pathways for the current to take.

While voltage can vary across different components (as it divides according to the resistance of each component in series), and resistance is a characteristic of each component, it is the current that is uniformly maintained. Power also varies at different points based on the voltage across each component and the current flowing through it, but once again, the current value remains the same throughout the entire series circuit.