Which of the Following Represents Active Transducer?

By K Balaji|Updated : January 24th, 2023

1. Thermistor

2. LVDT

3. Strain Gauge

4. Thermocouple

A thermocouple is an active transducer. A transducer is an electronic device that converts energy from one form to another. It typically transforms a signal from one form of energy to another. Examples of transducers include microphones, loudspeakers, thermometers, position and pressure sensors, and antennas.

Active Transducer

Active Transducers are transducers with the capacity to change one form of energy into another without relying on an external power source. Additionally called self-generating transducers. On the other hand, passive transducers are those that use an external power source to transform one form of energy into another. Additionally, they are known as externally energised 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.

Hence, a Thermocouple is an active transducer because it generates or derives energy from an external power source to work.

Summary:

Which of the Following Represents Active Transducer?

Out of the given options, an active transducer is a thermocouple. An electronic device known as a transducer transforms energy from one form to another. Usually, it changes a signal's energy form from one to another. Transducers include devices like microphones, speakers, thermometers, pressure and position sensors, and antennas. Moreover, there is a need for amplification in active transducers, which doesn't happen with passive transducers.

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