71. The value of temperature coefficient of resistance thermometer is
Answers
Answer:
Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used. The RTD wire is a pure material, typically platinum, nickel, or copper. The material has an accurate resistance/temperature relationship which is used to provide an indication of temperature. As RTD elements are fragile, they are often housed in protective probes.
RTDs, which have higher accuracy and repeatability, are slowly replacing
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Answer:
High and Positive
Explanation:
On increasing the temperature of metals, the resistance of metal increases. Therefore, the temperature coefficient of resistance of metals is positive.
On increasing the temperature of the insulators, the resistance decreases. Therefore, the temperature coefficient of the resistance of insulators is negative.