Answer: When two or more resistances are connected end to end consecutively, we refer to this as a connection in a series combination. In a series combination, the electric components are connected end to end along the same line. Any number of resistances that are connected in series have a combined resistance that is equal to the sum of the resistances that make up each individual resistance. The current that flows through each of the components is identical, and the voltage that is generated across the circuit is equal to the sum of the voltages that are generated across each of the components.
R = R1 + R2 + R3 + …..