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Question

# A thermopile is consisting of three identical thermocouples. The emf temperature relationship of a single thermocouple is given by V0=50TμV, where T is the temperature of heated source in (0C). If the output voltage measured across the thermopile is found to be 150mV then the approximate value of T in 0C is ?

A
100oC
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B
50oC
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C
1oC
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D
1000oC
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Solution

## The correct option is D 1000oCVoltage output of thermopile = 150mV ∴ Voltage output of one thermocouple = 1503= 50mV ∴ Emf - temperature relationship ⇒Vo=50TμV ∴50mV=50TμV ⇒T=50mV50μV ∴T=10000C Note: Since the connection of thermocouple is not mentioned by default it is chosen as series.

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