What remains constant in a series circuit?

In a series circuit, the current remains constant throughout all components. This is due to the fundamental nature of series circuits, where there is only one path for the electric current to flow. As a result, the same amount of current that leaves the power source flows through each component in the circuit, regardless of the resistance values of those components.

When more resistors are added in series, the total resistance increases, which can affect the overall current based on Ohm's Law (I = V/R). However, the current at any given point in the series will not vary; it will be the same before and after each resistor, maintaining a constant flow.

While voltage can vary across different components in the circuit based on their resistances, the current remains unchanged. This characteristic of series circuits is a key concept in understanding how electrical components interact in a single pathway configuration.