Question

Three resistances ri, r, and r3 joined in parallel. Draw circuit diagram and
Berive expression for equivalent resistance.​

Answer 1

In parallel connection voltage is same accross the resistors.
Then the equivalent resistance in parallel connection is 1/R=1/ri+1/r+1/r3.

The totalresistance of a set of resistors inparallel is found by adding up the reciprocals of the resistance values.