Potentiometers are variable resistance devices. A change in the linear or angular displacement of a potentiometer varies the effective length of its conductor, and therefore the resistance of the device.

2.  Introduction
 Types of Transducer
 Applications

3. Transducers
Transducer convert nonelectrical quantity into an electrical
signal in order to use electrical methods and techniques
for measurements, manipulation or control
An instrumentation system consists of:
Input device
Signal conditioning
Output device

4.  Passive Transducers
Passive transducers produce variation in some electrical
parameter which can be measured as a voltage or
current variation.
 Self-Generating Transducers
Self-Generating transducers produce an analog voltage
or current when stimulated by some physical form of
energy. They do not require external power.

5.  Resistance Transducer
 Capacitance Transducer
 Inductance Transducer
 Voltage and current Transducer.

6.  Potentiometers are variable resistance devices.
 A change in the linear or angular displacement of a
potentiometer varies the effective length of its conductor,
and therefore the resistance of the device.

7.  Potentiometers have a tendency for nonlinearity, and
care must be taken when a high degree of accuracy is
required.
 Trimmer potentiometers are often built into the circuit to
adjust the maximum and minimum output voltage to
correspond to the maximum and minimum
displacements of the measurement potentiometer.

8. Angular motion potentiometer and circuit
with trimmers for upper and lower limits

9.  Potentiometric transducers are widely used for sensing
displacement and velocity (both linear and angular)
 They also have various applications in automotive
industry, environmental monitoring, control, and
measurements