Question

You are givena number of 30 resistors what is the minimum number of these resistors you will need to get 75 ohm resistance

Answer 1

Answer: we need a minimum of four 30 ohms resistors to produce a 75 ohm resistance

Explanation:

it is very simple,

we first need to connect two 30 ohms resistors in parallel

we will get $\frac{1}{R} =\frac{1}{30} +\frac{1}{30} =\frac{2}{10} =\frac{1}{15} \\R = 15 ohm$

then we need to connect two 30 ohms resistors in series

R = 30+30 = 60 ohms

as both the combinations are connected to each other in series

15 ohm+60 ohm=75ohm

HOPE IT HELPS