PhysicsChapter 8: Electric Circuits
Thermistor (ntc)
Introduction
A thermistor is a resistor whose resistance changes significantly with temperature. An NTC thermistor has a negative temperature coefficient. For an NTC thermistor: temperature increases → resistance decreases temperature decreases → resistance increases
Definition
Why It Happens
As temperature rises, more charge carriers become available in the semiconductor material, allowing current to pass more easily.
Applications
NTC thermistors are used in: * temperature sensors; thermostatic control; electronic thermometers; overheating detection; temperature-compensation circuits.
LDR vs Thermistor
LDR responds mainly to light. Thermistor responds mainly to temperature.
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Thermistor (ntc)
Sticky Notes · Quick Revision
NTC
- HOT → LOW R
- COLD → HIGH R
SENSOR
- Temperature
60-second revision
- NTC:
- T ↑ → R ↓
- T ↓ → R ↑
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