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Thermal Resistance

A copper cons...

Question

A copper constantan thermocouple temperature measurement data with respect $0^{o} C$ as

Temperature $30$ $60$ $70$ $. . .$ $200$ $220$ $230$

Voltage $(m V)$ $0.5$ $0.75$ $0.93$ $. . .$ $9.7$ $10.2$ $11.0$

The copper constantan thermcouple is connected to a potentiometer whose terminals are at $30^{o} C,$ the potentiometer reads $9.7 m V$ then the open circuit temperature of the thermocouple at $0^{o} C$ is
220

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Solution

The correct option is A 220
$\begin{matrix} E 0^{0} \to 220^{0} C \end{matrix} = \begin{matrix} E 0^{0} \to 30^{0} C \end{matrix} + \begin{matrix} E 30^{0} \to 220^{0} C \end{matrix}$

$= 0.5 m V + 9. m V$

$= 10.2 m V$

$Corresponding temperature to 10.2 m V is 220^{o} C .$

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Temperature	$30$	$60$	$70$	$. . .$	$200$	$220$	$230$
Voltage $(m V)$	$0.5$	$0.75$	$0.93$	$. . .$	$9.7$	$10.2$	$11.0$