Circuit Resistance
R1 (Ω)
R2 (Ω)
R3 (Ω, optional)
Resistors in series simply add together. Resistors in parallel have a combined resistance lower than any individual resistor — current has multiple paths, reducing overall opposition.
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Pro Tip
Adding resistors in parallel decreases total resistance; adding in series increases it. Opposite to what you might expect with batteries.
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Did You Know?
Your home's electrical outlets are all in parallel — so adding devices doesn't increase total voltage, only current draw.
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