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Resistance in a Series Circuit is Additive

Resistance in a series circuit is said to be additive. That means to find the total resistance in any series circuit, just add up the resistances of each component in that circuit.

Here is the formula for resistance total in a series circuit with 4 components:

Rt= R1 + R2 + R3 + R4

If you know the total resistance and all the component resistances except one, then here are formulas for a circuit with 4 components:

R1 = Rt - R2 - R3 - R4

R2 = Rt - R1 - R3 - R4

R3 = Rt - R1 - R2 - R4

R4 = Rt - R1 - R2 - R3

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