Calculating Temperature from Resistance

Oct 13, 2025 by wbrum.org 91 views

A Resistance Thermometer: Understanding Temperature and Resistance

A resistance thermometer is a device used to measure temperature based on the change in electrical resistance of a material with temperature. In this article, we will explore how to calculate the temperature corresponding to a given resistance value using the resistance thermometer's characteristics.

The Resistance Thermometer's Characteristics

A resistance thermometer has a resistance of $$20 \Omega$$ at $$0^{\circ} C$$ and $$85 \Omega$$ at a higher temperature. This means that the resistance of the thermometer increases with temperature. We can use this information to calculate the temperature corresponding to a given resistance value.

Calculating Temperature from Resistance

To calculate the temperature corresponding to a given resistance value, we can use the following formula:

T = T_0 + \frac{R - R_0}{\alpha}

where:

$T$$ is the temperature in degrees Celsius$
$T_0$$ is the reference temperature (in this case, $$0^{\circ} C$$)$
$R$$ is the resistance value at the unknown temperature$
$R_0$$ is the resistance value at the reference temperature (in this case, $$20 \Omega$$)$
$\alpha$$ is the temperature coefficient of resistance (in this case, $$\frac{85 - 20}{T - 0}$$)$

Calculating the Temperature Coefficient of Resistance

To calculate the temperature coefficient of resistance, we need to know the resistance value at the higher temperature. In this case, the resistance value at the higher temperature is $$85 \Omega$$.

We can calculate the temperature coefficient of resistance using the following formula:

\alpha = \frac{R - R_0}{T - T_0}

where:

$\alpha$$ is the temperature coefficient of resistance$
$R$$ is the resistance value at the higher temperature (in this case, $$85 \Omega$$)$
$R_0$$ is the resistance value at the reference temperature (in this case, $$20 \Omega$$)$
$T$$ is the temperature at the higher temperature (in this case, unknown)$
$T_0$$ is the reference temperature (in this case, $$0^{\circ} C$$)$

Plugging in the Values

Now that we have the formula for the temperature coefficient of resistance, we can plug in the values to calculate it.

\alpha = \frac{85 - 20}{T - 0}

\alpha = \frac{65}{T}

Calculating the Temperature

Now that we have the temperature coefficient of resistance, we can plug in the values to calculate the temperature corresponding to a given resistance value.

T = T_0 + \frac{R - R_0}{\alpha}

T = 0 + \frac{52 - 20}{\frac{65}{T}}

T = \frac{32 \times T}{65}

T = \frac{32}{65} \times T

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