Difference between Active and Passive Transducer

 

Feature	Active Transducers	Passive Transducers
Power Supply	Requires an external power source to operate	Does not require an external power source
Energy Conversion	Converts physical quantities directly into electrical signals	Converts physical quantities into a change in non-electrical form (e.g., resistance)
Output Signal	Direct electrical signal (voltage or current)	Change in resistance, capacitance, or inductance (needs external circuit to measure)
Signal Processing	Signal can be read directly, no need for complex circuitry	Requires external circuits (e.g., bridge circuits) to process the signal
Examples	Thermocouples, Piezoelectric sensors, Photovoltaic cells	Strain gauges, Thermistors, LVDTs