How do resistors influence electrical resistance when added in series?

When resistors are added in series, the total resistance of the circuit increases. This is because the total resistance is calculated by simply adding the resistances of each individual resistor. Each resistor contributes to the overall opposition to the flow of electric current in the circuit. The formula for total resistance in a series circuit is R_total = R1 + R2 + R3 + ..., where R1, R2, R3, etc., represent the resistance values of each resistor. As more resistors are added, the sum of their resistances leads to an increase in total resistance, thereby making it more difficult for current to flow through the circuit. Consequently, the addition of resistors in series directly correlates to an increase in electrical resistance.