Question:
What is the minimum resistance which can be made using 1 five resistors each of 1/5 Ω ?
(a) $\frac{1}{5} \Omega$
(b) $25 \Omega$
(c) $\frac{1}{10} \Omega$
(d) $\frac{1}{25} \Omega$
Solution:
(d).
Explanation: $\frac{1}{R}=\frac{1}{1 / 5}+\frac{1}{1 / 5}+\frac{1}{1 / 5}+\frac{1}{1 / 5}+\frac{1}{1 / 5}=25$
or $R=\frac{1}{25} \Omega$