adding more resistors in series increases the total resistance of the circuit . this is because the potential difference is shared between more resistors, and as a result the potential difference across each of them is less than before, and as the total potential difference is unchanged, the total resistance is therefore larger.
potential difference in series
in series, potential difference is shared between lamps and provided by cells.
if one component is removed or disconnected, the circuit is broken and all components stop. this is why few practical circuits are connected in series
in a series circuits, there is a bigger potential difference when more cells are in series, provided that the cells are connected in the same way.
in a series circuit, the total potential difference is shared among the various components so the potential differences of each component add up to the total potential difference of the sources
current is the same throughout a series circuit. the size of the current is determined by the total potential difference and the total resistance.
in a series circuit the total resistance is the sum of the resistance of the components.
in a series circuit, current is the same everywhere so current is reduced when a resistor is added while the resistance of the circuit increases.
the bigger a componentsresistance in series, the bigger its potential difference