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When connected in series, the overall effective resistance of a bunch of individual resistors is

the sum of the individual resistances. It's always more than the resistance of any individual.

When connected in parallel, the reciprocal of the overall resistance of a bunch of individual resistors

is the sum of the reciprocals of the individual resistances. It's always less than the resistance of any

individual.

When two resistors are connected in parallel, the overall effective resistance of the pair is

(the product of the two individual resistances) divided by (the sum of the two individual resistances).

It's always less than the smaller individual resistance.

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