Answer: A thermocouple is an active transducer.
The transducers that have the ability to convert one form of energy into another form without using an external source of power are called Active Transducers. They are also known as self-generating transducers.
On the other hand, the transducers that convert one form of energy into another by making use of an external source of power are known as Passive Transducers. They are also called externally energized transducers.
Difference between Active Transducer and Passive Transducer
Following are the key differences between Active Transducer and Passive Transducer:
Active Transducer | Passive Transducer |
Operational energy is not derived from an external source of power. | Operational energy is derived from an external source of power. |
Electrical current or voltage is the generated output. | Quantity varies related to the passive elements. |
Simple conversion. | Complex conversion. |
Need of further amplification. | Further amplification is not required. |
Tachogenerators, Thermocouples, and Piezoelectric crystals are examples. | Potentiometers, thermistors, etc. are examples. |
Summary:
Which of the following represents an active transducer?
Out of the given options, Thermocouple is an active transducer.
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