What remains constant throughout a series circuit?

In a series circuit, the current remains constant throughout all components connected in the circuit. This is because there is only one path for the flow of electric charge. When current flows from the power source, it encounters each component (like resistors or light bulbs) sequentially. Since the same amount of charge that leaves the source must pass through each device, the current does not change as it travels through the series circuit.

On the other hand, the voltage across each component can vary depending on their resistance, leading to a drop in voltage across each device. Total power can also change as you add more components, and the total resistance increases with each component in the series, affecting the overall circuit behavior. However, the key characteristic of a series circuit is that the current remains the same at every point in the circuit.