A variable resistance device comprises a resistive member having a
resistive resilient material. A first conductor is configured to be
electrically coupled with the resistive member at a first contact
location over a first contact area. A second conductor is configured to
be electrically coupled with the resistance member at a second contact
location over a second contact area. The first contact location and
second contact location are spaced from one another by a distance. The
resistance between the first conductor at the first contact location and
the second conductor at the second contact location is equal to the sum
of a straight resistance component and a parallel path resistance
component. At least one of the first location, the second location, the
first contact area, and the second contact area is changed to produce a
change in resistance between the first conductor and the second
conductor. The straight resistance component increases or decreases as
the distance between the first contact location and the second contact
location increases or decrease, respectively. The parallel path
resistance component has preset desired characteristics based on selected
first and second contact locations and selected first and second contact
areas. The first and second contact locations and first and second
contact areas can be selected such that the change in the resistance
between the first and second contact locations is at least substantially
equal to the change in the straight resistance component or the change in
the parallel path resistance component.