Question

show how would you join three resistors ,each of resistance 9ohm's so that the equivalent resistance of the combination is?

Answer 1

When we connect two resistance of the same value in parallel the equivalent

resistance will be half of their value which is 4.5 ohms. By putting

9 ohms resistance in series with this combination will give us

9+4.5=13.5ohms

In the lower figure when we put two resistors in series, their equivalent

resistance will be 18 ohms which is parallel with 9 ohm resistance.

Requivalent=(18)(9)/9+18=6ohms