1. It may be defined as any device that converts energy is one form to energy in other form.
2. A transducer is an electronic device that converts energy from one form to another form.               
                                                     3. A transducer converts a signal in one form of energy to a signal in another form.
Most of the transducers either convert electrical energy into mechanical displacement and/or convert some non-electrical physical quantity to an electrical signal. 

In an electronic instrumentation system, the functions of a transducer are two fold
1. To detect or sense the presence, magnitude and changes in the physical quantity being measured.
2. To provideta proportional electrical output signal as shown in fig.

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