.

Figure 2.2.2 Potentiometer: electric circuit

VA = I RA

(2.2.1)

But

(2.2.2)

Therefore

(2.2.3)

As we know that R = ρL /A where ρ is electrical resistivity, L is length of resistor and A is area of cross section

(2.2.4)

Applications of potentiometer

These sensors are primarily used in the control systems with a feedback loop to ensure that the moving member or component reaches its commanded position.

These are typically used on machine-tool controls, elevators, liquid-level assemblies, forklift trucks, automobile throttle controls. In manufacturing, these are used in control of injection molding machines, woodworking machinery, printing, spraying, robotics, etc. These are also used in computer-controlled monitoring of sports equipment.