Series Resistors Formula and Calculations with Examples

A series combination of resistors involves a connection in which one end of a resistor connects to another end of the resistor and there is no other connection in between them.

Circuit Diagram of Series Resistors

The figure below displays three resistors in series configuration:

Formula to Solve Series Resistors

The total or equivalent resistance of series resistance can be calculated using the following formula:

Req = R1 + R2 + … + Rn

In case of three resistors:

Req = R1 + R2 + R3

Series Resistors Solved Examples

Find the equivalent resistance of two resistors of 5 and 10 ohms connected in series.

Req = R1 + R2 = 5 + 10 ohms = 15 ohms


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