Q. Suppose you have three resistors of 20 ohm , 50 ohm and 100 ohm . What minimum and maximum resistances can you obtain from these resistors?
(a) 15Ω , 170Ω
(b) 12.5Ω , 170Ω
(c) 12.5Ω , 150Ω
(d) 15Ω, 150Ω
For minimum resistance all the resistors are connected in parallel.
1/Rmin = 1/20 + 1/50 + 1/100
For maximum Resistance , all the resistors are connected in series
Rmax = 20 + 50 + 100 = 170 ohm