Resistance transducer is one of the simplest and important groups of transducers. These are transducers whose electrical resistance is varied in accordance with the input quantity (measurand). Quantities like displacement, acceleration, force, pressure, temperature etc. can be transduced using this type of transducers.

## Basic Principle of Resistance Transducer

The basic principle of a resistance transducer is very simple.

Resistance of a conducting wire is given by

$$R=\frac{sl}{A}$$

Where s is the resistivity of the material of the wire, l is the length of the wire and A is the area of cross-section.

Any measurand which varies any of these quantities like s,l or a, will result in a change in resistance of the wire. These change in resistance can be converted to a change in voltage by an electrical circuitry and thus a transducer is obtained.

The advantages of using a resistance transducer are,

• Quick response
• Low cost
• Suitable for both AC and DC
• Available in different sizes
• Easy operation