There are a layer number of physical or non-electrical quantities which can be measured with the help of electrical or electronic instruments. Basically, an instrumentation system consists of three main parts, namely input device, a signal conditioning device and an output device. The output device may be a simple indicating meter, display etc.

Electrical Transducer
Electrical Transducer

What is an Electrical Transducer?

An electrical transducer is a device that converts non-electrical or physical quantity into electrical signal or quantity.

For most of the instrumentation systems, the input quantities are non-electrical, but these quantities are required to convert into electrical. Because electrical signal or quantity can be easily measured and processed.


  • Electrical signals can be easily processed as per need.
  • The electrical signals can be converted any desired form.
  • The power required for electrical or electronic system is very small.
  • These signals can easily transmitted and processed for the purpose of measurement.

Classification of Transducers

The transducer are classified on the basis of power utilized them for operations, there are two basic types of transducers (i) Active transducer (ii) Passive transducer.

Active Transducer

Active transducers are those transducers that does not require external power for their operation. Active transducers, also called self generating transducer. In these transducers, a voltage or current produced proportional to the quantity under measurement. 

Thermocouple and Pizeocrystal are example of an active transducer.

Passive Transducer

Electrical transducers are those transducers that require external power for their operation. In these transducers, some parameters is varied by the measurand which in turn varies the electrical quantity such as voltage or current.