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Compare active and passive transducer.

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Active Transducer
Passive Transducer 
Operate under energy conversion principle. 
Operate under energy controlling principle. 
Ex. Thermocouple, Piezoelectric Transducer 
Ex. Thermistors, Strain Gauges 
Do not require external power supply for its operation.
Require external power supply for its operation. 
They produce an electrical signal proportional to the input physical quantity.
They produce an output signal in the form of some variation in resistance, capacitance or any other electrical parameter, which has to be converted to an equivalent current or voltage signal.
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Active Transducer
Passive transducer
Don’t require external power for operation.
Require external power supply for operation.
It is also called selfgenerating transducer.
It is also called Externally powered transducer.
Circuit is simple.
Circuit is complex.
Active bridge is not required.
Active bridge is required.
Operate under energy conversion principle.
Operate under energy controlling Principle.
Ex-Thermocouple, piezoelectric.
Ex Thermistor, Strain Gauges.

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