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एक ही धातु के बने समान त्रिज्या के तीन चालक तारो की लम्बाइयों में `1:2:3` के अनुपात है । निम्न स्थितियों में धाराओं में अनुपात बताइये - (i) यदि उन्हें श्रेणी क्रम में जोड़ा जाये , (ii) यदि उन्हें समांतर क्रम में जोड़ा जाये ।

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(i) 1:1:1 क्योकि श्रेणी क्रम में सभी चालकों में समान धारा प्रवाहित होती है ,
( ii) ` R prop l ` " " `R_(1) : R_(2) :R_(3) = l_(1) : l_(2) : l_(3) = l : 2 : 3 `
अतः ` R_(1) = x , R_(2) = 2x ` तथा ` R_(3) = 3x `
अब ` I_(1) = V/(R_(1)) = V/x : V/(2x) : V/(3x) = 1: 1/2 : 1:3 = 6:3:2 `

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