In an RTD (resistance type device), as temperature increases, resistance will:

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Multiple Choice

In an RTD (resistance type device), as temperature increases, resistance will:

Explanation:
RTDs are metal-based sensors, and metals have a positive temperature coefficient: their resistivity increases as temperature goes up. Over typical operating ranges, this change is nearly linear, often expressed as R ≈ R0[1 + α(T − T0)], where α is the temperature coefficient. So as temperature increases, resistance rises in a roughly linear fashion. It isn’t decreasing, nor does it rise exponentially or logarithmically within common RTD ranges. This is why the best answer is that resistance increases linearly with temperature.

RTDs are metal-based sensors, and metals have a positive temperature coefficient: their resistivity increases as temperature goes up. Over typical operating ranges, this change is nearly linear, often expressed as R ≈ R0[1 + α(T − T0)], where α is the temperature coefficient. So as temperature increases, resistance rises in a roughly linear fashion. It isn’t decreasing, nor does it rise exponentially or logarithmically within common RTD ranges. This is why the best answer is that resistance increases linearly with temperature.

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