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When two resistors are connected in series, the same current flows in each of them and the effective resistance of the circuit will always be greater than any one of the two resistors taken alone. The effective resistance of a circuit with two resistors (R1 and R2) connected in series is simply the sum of the two resistance values. Thus the effective resistance, R, of the circuit will be given by:
R = R1 + R2
Similarly, where three resistors (R1, R2, and R3) are connected in series, the effective resistance of the combined circuit will be given by:
R = R1 + R2 + R3
<^< Resistor Construction | Course index | Worksheet: Resistors in Series >^>
