What is the resistance of a PT100 at 0°C?

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Multiple Choice

What is the resistance of a PT100 at 0°C?

Explanation:
A PT100 is a platinum resistance thermometer where the number 100 indicates its nominal resistance in ohms at 0°C. At this reference temperature, the resistance is defined as 100 ohms, which is why that option is the correct choice. The resistance then changes with temperature with a small positive coefficient, roughly R ≈ R0[1 + αT], where α is about 0.00385 per degree Celsius for standard platinum. So at 0°C, T = 0, and R = R0 = 100 Ω. The other values don’t match this defined reference point, since a PT100 is not zero, ten, or a thousand ohms at 0°C.

A PT100 is a platinum resistance thermometer where the number 100 indicates its nominal resistance in ohms at 0°C. At this reference temperature, the resistance is defined as 100 ohms, which is why that option is the correct choice. The resistance then changes with temperature with a small positive coefficient, roughly R ≈ R0[1 + αT], where α is about 0.00385 per degree Celsius for standard platinum. So at 0°C, T = 0, and R = R0 = 100 Ω. The other values don’t match this defined reference point, since a PT100 is not zero, ten, or a thousand ohms at 0°C.

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