Which one of the following transducers requires power supply for its operation?ThermocouplePhotovoltaic cellPiezoelectric crystal Thermistor
Question
Which one of the following transducers requires power supply for its operation?ThermocouplePhotovoltaic cellPiezoelectric crystal Thermistor
Solution
The transducer that requires power supply for its operation is the Thermistor.
Here's why:
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Thermocouple: It does not require a power supply. It works on the principle of the Seebeck effect, which states that a voltage difference is created when two dissimilar metals are joined at two junctions and one junction is heated more than the other.
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Photovoltaic cell: It also does not require a power supply. It works on the principle of the photovoltaic effect, which states that when light (photons) hits a material, it can cause the material to emit electrons, creating a voltage difference.
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Piezoelectric crystal: It does not require a power supply either. It works on the principle of the piezoelectric effect, which states that when mechanical stress or strain is applied to a material, it generates an electric charge.
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Thermistor: It requires a power supply for its operation. A thermistor is a type of resistor whose resistance changes significantly with temperature. It needs a power supply to measure the change in resistance, which can then be used to calculate the temperature.
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