the potentiometer . The parameter a varies from 0 to 1 as the wiper of the potentiometer is moved
from one end of the potentiometer to the other . The resistances R4 and Rs are described by the
equations
R4= aRp ( 4 . 9 - 1 )
and
Rs = ( 1 — a ) R p ( 4 . 9 - 2 )
Our objective is to analyze this circuit to determine how the output voltage changes as the position of
the potentiometer wiper is changed .