Active Transducer:- Transducers which don’t require external power supply for their operation known as active transducer. These are self generating transducer
Example 1) Photo Voltaic cell: It produces emf which is directly proportional to intensity of incident light without any external power supply.
Passive Transducers:- Transducers which require external power supply for their operation known as active transducer. These are not self generating transducer.
Example 1) Strain gauge: Converts pressure into equivalent change in resistance.
Active Transducer:- A transducer which do not requires external energy source to convert signal from one form to another. Active transducers passes gain. e.g. Thermometer,Thermocuople, bourdon tubes, piezoelectric transducer etc…
Passive Transducer:- A transducer which requires external energy sources while converting signal from one form to other form. Passive transducer passes loss. e.g. Thermistor, strain gauges, LVDT etc….