Differentiate between active and passive transducers
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Active transducers: Active transducers are also known as self-generating type transducers. They do not require external power source to produce the output. They work under energy conversion principle. Active transducers develop their own voltage or current. The energy required for the production of the output signal is obtained from the physical phenomenon being measured. 

Ex: piezoelectric transducer, thermocouple

Passive transducers: Passive transducers are also known as externally powered transducers. They require external power source to produce the output. They work under energy controlling principle. Ex: resistive, capacitive, inductive transducer. 
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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.

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