What is the effect of a series circuit on the total resistance when more resistors are added?

In a series circuit, the total resistance is the sum of the individual resistances of all the resistors connected in that circuit. When additional resistors are added in series, their individual resistances accumulate, leading to an increase in the overall resistance.

This increase occurs because each additional resistor adds its resistance to the total path that the current must travel. Since the current must pass through each resistor sequentially, increasing the number of resistors effectively increases the opposition to the flow of electric charge in the circuit. Thus, one can conclude that adding resistors in a series configuration directly increases the total resistance.

Hence, the correct answer highlights that the total resistance increases as more resistors are added in series.