what is the minimum resistance which can be made using five resistors each of 1/5ohm's
(A) 1/5ohm's
(B)1/25ohm's
(c)1/10ohm's
(d)25 ohm's
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Answer : The minimum resistance which can be made by using five resistors each of 1 / 5 ohm will be 1/25 ohm
Explanation:
R1 = R2 = R3 = R4 = R5 = 1/5 ohm. ( given )
To find : Minimum Resistance ( Rp ) = ?
The Minimum Resistance is always obtained when the resistors are connected in parallel combination.
∴ 1/Rp = 1/ R1 + 1/ R2 + 1/ R3 + 1/R4 + 1/ R5
∴ 1/Rp = 25 / 1 ( after substitution R1 = R2 = R3 = R4 = R5 = 1/5 )
∴ Rp = 1/25
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