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What impact does temperature have on materials used in temperature sensors like RTDs?
Resistance decreases as temperature increases
Resistance remains constant regardless of temperature
Resistance increases as temperature increases
Resistance varies unpredictably with temperature
The correct answer is: Resistance increases as temperature increases
The choice indicating that resistance increases as temperature increases is correct because it reflects the fundamental operational principle of Resistance Temperature Detectors (RTDs). These devices utilize the property of metals, typically platinum, which exhibit a predictable increase in electrical resistance with rising temperature. In RTDs, this resistance change with temperature is a linear function over a significant range, making them reliable for precise temperature measurements. As the temperature of the RTD increases, the atoms within the metal vibrate more, which impedes the flow of electrons. Thus, the electrical resistance increases, providing a measurable parameter for temperature readings. This principle is fundamental not only to temperature measurement but also to the design and application of temperature sensors in various industrial processes, ensuring accurate and reliable temperature monitoring.