What is the nominal resistance of a Pt100 RTD at 0 °C?

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Multiple Choice

What is the nominal resistance of a Pt100 RTD at 0 °C?

Explanation:
The concept being tested is how RTD naming relates to its resistance at the reference temperature. Pt100 means a platinum resistance thermometer with a nominal resistance of 100 ohms at 0°C. The resistance of an RTD varies with temperature according to R(T) ≈ R0(1 + αT) for small ranges, where R0 is the resistance at the reference temperature and α for platinum is about 0.00385 per degree Celsius. At 0°C, T = 0, so R(T) = R0 = 100 Ω. The other values would correspond to different RTDs (Pt50, Pt200, Pt500), not Pt100.

The concept being tested is how RTD naming relates to its resistance at the reference temperature. Pt100 means a platinum resistance thermometer with a nominal resistance of 100 ohms at 0°C. The resistance of an RTD varies with temperature according to R(T) ≈ R0(1 + αT) for small ranges, where R0 is the resistance at the reference temperature and α for platinum is about 0.00385 per degree Celsius. At 0°C, T = 0, so R(T) = R0 = 100 Ω. The other values would correspond to different RTDs (Pt50, Pt200, Pt500), not Pt100.

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