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  4. Thermocouples are used to measure temperature in the linear parts of the emf versus temperature graph with cold junction at 0° C. The thermo-electric power of Pt , Ni thermocouple are -4 and -20 microvolt per ° C respectively. What will be the magnitudes of emfs of the thermocouple when the cold junction is at 0° C and the hot junction is at 100° C ?

Q. Thermocouples are used to measure temperature in the linear parts of the emf versus temperature graph with cold junction at $0^{\circ} C$. The thermo-electric power of $Pt , Ni$ thermocouple are $-4$ and $-20$ microvolt per ${ }^{\circ} C$ respectively. What will be the magnitudes of emfs of the thermocouple when the cold junction is at $0^{\circ} C$ and the hot junction is at $100^{\circ} C$ ?

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Solution:

Magnitude of emf
$=[-4-(-20)] \times(100-0) \times 10^{-6}$
$\Rightarrow =1.6 \times 10^{-3} V$
$\Rightarrow =1.6\, mV$

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