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S E N S O R P R O J E C T EXPERIMENTS WITH A THERMISTOR AMIRUL OMAR INTRODUCTION What is a thermistor? A thermistor is a type of temperature-sensitive resistor, meaning that its resistance is affected by a change in temperature. Thermistors can be categorised by their temperature coefficient of resistance, which is ratio of increase in resistance to its resistance temperature rise. Therefore, there are 2 main types, namely positive temperature coefficient (PTC) and negative temperature coefficient (NTC) thermistors. In a PTC thermistor, resistance increases with increasing temperature, whereas in a NTC thermistor, its resistance decreases instead. The graph below illustrates this fact: Operating over a range of -200°C to + 1000°C, they are supplied in glass bead, disc, chips and probe formats. NTC thermistors should be chosen over PTC thermistors when a continuous change of resistance is required over a wide temperature range. They offer mechanical, thermal and electrical stability, together with...

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