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Rezistory v sérii a paralelne

Resistors in Series & Parallel

Resistor values in Ω (comma separated)

e.g. 100, 220, 330

What is Resistors in Series & Parallel?

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Resistors can be connected in series (end-to-end, increasing total resistance) or parallel (side-by-side, decreasing total resistance). Understanding these configurations is fundamental to circuit analysis and electronics design.

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How to Resistors in Series & Parallel

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1Series: R_total = R1 + R2 + R3 + ... (resistances add)
2Parallel: 1/R_total = 1/R1 + 1/R2 + 1/R3 ... (reciprocals add)
3Two resistors in parallel: R_total = (R1 × R2) / (R1 + R2)
4Voltage divides in series; current divides in parallel

Worked Examples

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Example 1

Given:100Ω and 100Ω in parallel

Výsledok:50Ω total

(100×100)/(100+100) = 50

Example 2

Given:100Ω and 100Ω in series

Výsledok:200Ω total

Simple addition

Resistor colour code (4-band)

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Colour	Value	Multiplier
Black	0	×1
Brown	1	×10
Red	2	×100
Orange	3	×1,000
Yellow	4	×10,000
Green	5	×100,000
Blue	6	×1,000,000

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Did you know?

The standard E24 resistor series was designed so that successive values overlap at ±5% tolerance — ensuring you can always find a resistor within 5% of any desired value.

References

›Resistor — Wikipedia

Accuracy-checked

Reviewed October 2026

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