Question:
RTDs have
RTDs have
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Platinum (Pt100) is the most common RTD material because it is extremely stable and has a very linear PTC over a wide temperature range.
Updated On: Jul 1, 2026
- Negative temperature coefficient
- Positive temperature coefficient
- Either type of temperature coefficient
- High tolerance
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The Correct Option is B
Solution and Explanation
An RTD (Resistance Temperature Detector) is a sensor whose resistance changes with temperature. They are typically made from pure metals like platinum, nickel, or copper.
1. Positive Temperature Coefficient (PTC):
Nearly all metals used in RTDs exhibit a Positive Temperature Coefficient. This means that as the temperature increases, the electrical resistance of the metal also increases.
2. The Mechanism: In metals, as the temperature rises, the atoms vibrate more vigorously. These vibrations increase the number of collisions between the atoms and the flowing electrons, effectively creating more "friction" or resistance to the current.
3. Comparison with Thermistors:
• RTDs (Metals): Have a PTC (Resistance increases with heat).
• Thermistors (Semiconductors): Usually have a Negative Temperature Coefficient (NTC), meaning their resistance decreases as temperature rises.
2. The Mechanism: In metals, as the temperature rises, the atoms vibrate more vigorously. These vibrations increase the number of collisions between the atoms and the flowing electrons, effectively creating more "friction" or resistance to the current.
3. Comparison with Thermistors:
• RTDs (Metals): Have a PTC (Resistance increases with heat).
• Thermistors (Semiconductors): Usually have a Negative Temperature Coefficient (NTC), meaning their resistance decreases as temperature rises.
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