At neutral temperature,the thermoelectric pow | vedclass

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(A) The thermoelectric electromotive force $(E)$ in a thermocouple is given by the relation $E = \alpha 	heta + \frac{1}{2} \beta 	heta^2$,where $

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(A) The thermoelectric electromotive force $(E)$ in a thermocouple is given by the relation $E = \alpha 	heta + \frac{1}{2} \beta 	heta^2$,where $	heta$ is the temperature difference between the junctions.Thermoelectric power is defined as the rate of change of thermoelectric $EMF$ with respect to temperature,given by $P = \frac{dE}{dT}$.At the neutral temperature $(T_n)$,the thermoelectric $EMF$ reaches its maximum value.Since the $EMF$ is maximum at the neutral temperature,its derivative with respect to temperature must be zero at that point.Therefore,$\frac{dE}{dT} = 0$ at the neutral temperature.

At neutral temperature,the thermoelectric power $\left( \frac{dE}{dT} \right)$ has the value:

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