🔍 Key Concepts

• Thermistor behavior – how resistance changes with temperature for positive vs. negative temperature coefficient types • Difference between a thermistor, RTD (resistance temperature detector), and thermocouple • Meaning of positive vs negative temperature coefficient in resistive devices

💭 Think About

• Ask yourself: if resistance goes DOWN when temperature goes UP, is that called a positive or negative temperature coefficient? • Which of the listed devices is specifically known for having a large, nonlinear change in resistance with temperature? • Which devices in the list measure temperature by resistance change, and which one works on a different principle (like voltage generated by temperature difference)?

✅ Before You Answer

• Make sure you match "resistance decreases when temperature increases" to the correct term (positive or negative coefficient). • Eliminate any device that does not primarily use resistance change as its sensing method. • Confirm which option explicitly mentions the correct temperature coefficient sign that matches the behavior described in the question.