Question

what is the work of rheo state in potentiometer​

Answer 1

rheostat is type of device which has variable resistance so we use it in potentiometer or any other electronic device vary the resistance..

Answer 2

Potentiometer and rheostat are same while rheostat are usually much beefier as they are generally used in high power situations

These two potentiometer and rheostat are tapp off signal, voltage or terminals from slider