Thermocouples can be connected in series/parallel to obtain greater sensitivity called as

• A. Thermistor
• B. None of these
• C. Thermometer
• D. Thermopile

Answer: (D)

A thermopile is an electronic device that converts thermal energy into electrical energy.
It is composed of several thermocouples connected usually in series or less commonly, in parallel.
Thermopiles are used for contactless temperature sensing.
The function of a thermopile is to transfer the heat radiation emitted from the object to a voltage output.
The output is in the range of tens or hundreds of millivolts.