How To Calculate Temp From Resistance

Temperature from Resistance Equation:

\[ T = \frac{1}{\left(\frac{1}{T_0} + \frac{1}{B} \times \ln\left(\frac{R}{R_0}\right)\right)} \]

Reference Temperature (T₀):

B Value:

Measured Resistance (R):

Reference Resistance (R₀):

Calculated Temperature (T):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Temperature from Resistance Equation?

The temperature from resistance equation calculates the temperature of a thermistor or other temperature-sensitive resistor based on its current resistance, reference values, and material properties. This is commonly used in electronic temperature sensing applications.

2. How Does the Calculator Work?

The calculator uses the temperature from resistance equation:

\[ T = \frac{1}{\left(\frac{1}{T_0} + \frac{1}{B} \times \ln\left(\frac{R}{R_0}\right)\right)} \]

Where:

\( T \) — Calculated temperature (K)
\( T_0 \) — Reference temperature (K)
\( B \) — Material-specific coefficient (K)
\( R \) — Measured resistance (Ω)
\( R_0 \) — Resistance at reference temperature (Ω)

Explanation: The equation models the non-linear relationship between resistance and temperature in thermistors, where resistance changes exponentially with temperature.

3. Importance of Temperature Calculation

Details: Accurate temperature calculation from resistance is crucial for temperature monitoring systems, thermal protection circuits, and precision temperature control applications.

4. Using the Calculator

Tips: Enter all values in their respective units. Ensure reference temperature and resistance values match the manufacturer's specifications for your component.

5. Frequently Asked Questions (FAQ)

Q1: What types of sensors use this equation?
A: This equation is primarily used with NTC (Negative Temperature Coefficient) thermistors.

Q2: Where can I find the B value for my thermistor?
A: The B value is typically provided in the component's datasheet, often specified for a particular temperature range.

Q3: What are typical reference temperatures?
A: Common reference temperatures are 25°C (298.15K) or 0°C (273.15K), but always check your specific component's datasheet.

Q4: Can this be used for PTC thermistors?
A: No, this equation is specifically for NTC thermistors. PTC (Positive Temperature Coefficient) thermistors have different characteristics.

Q5: How accurate is this calculation?
A: Accuracy depends on the quality of your resistance measurement and how closely the component follows the ideal model. High-quality thermistors can achieve ±0.1°C accuracy.