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Combined Resistance

Exam code: 5054
Written by: Ashika|Reviewed by: Caroline Carroll|Updated 2 July 2026

Resistors in Series & Parallel

Resistors in Series & Parallel

Resistors in Series

  • When two or more components are connected in series:

    • The combined resistance of the components is equal to the sum of individual resistances

Combined Resistance in Series

combined-resistance, IGCSE & GCSE Physics revision notes

When several components are connected in series, their combined resistance is equal to the sum of their individual resistances

Resistors in Parallel

  • When resistors are connected in parallel, the combined resistance decreases and is less than the resistance of any of the individual components

  • If two resistors of equal resistance are connected in parallel, then the combined resistance will halve

Combined Resistance in Parallel

Equal resistors parallel, IGCSE & GCSE Physics revision notes

The above resistors will have a combined resistance of 2 Ω − half the value of each resistor