Question
Sat March 14, 2015 By: Manalivishwakarma.1

Calculate the value of the resistence which mustbe connected with 15 ohm resistence to provide an effective resistence of 6ohm

Expert Reply
Jyothi Nair
Sat March 14, 2015
begin mathsize 14px style Given space that space the space effective space resistance comma straight R subscript eff equals space 6 space straight capital omega Let space straight R subscript 1 space and space straight R subscript 2 space be space the space resistance space connected space in space parallel space to space obtain space an space effective space 6 space straight capital omega Given space space straight R subscript 1 equals 15 space straight capital omega We space know space that space when space resistance space are space connected space in space parallel comma 1 over straight R subscript eff equals 1 over straight R subscript 1 plus fraction numerator 1 over denominator space straight R subscript 2 end fraction 1 over 6 equals 1 over 15 plus fraction numerator 1 over denominator space straight R subscript 2 end fraction fraction numerator 1 over denominator space straight R subscript 2 end fraction equals 1 over 6 minus 1 over 15 fraction numerator 1 over denominator space straight R subscript 2 end fraction equals 3 over 30 equals 1 over 10 rightwards double arrow straight R subscript 2 space equals 10 space straight capital omega end style
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