The combined resistance R of two resistances R₁ and R₂ connected in parallel [see Fig. 7.3(a)] is equal to the product of the individual resistances divided by their sum. If the two resistances are connected in series [see Fig. 7.3(b)], their combined resistance is the sum of their individual resistances. If two resistances connected in parallel have a combined resistance of 3.0 Ω and the same two resistances have a combined resistance of 16Ω when connected in series, what are the resistances?

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R₁R₂ R=R₁+R₂₁ R₁ www R₂ (a) R=R₁+R₂ ww R₁ Fig. 7.3 (b) R₂