Student Name: Sami M. AlmasriStudent ID: U00013948Thermistors are one of the many types of sensors; however, it has a unique ability which is varying its temperature significantly according top temperature. There are two types of Thermistors; however it all varies depending on the sign of the first-order temperature coefficient of resistance.

Where, : the change in resistance.: The change in temperature.K: First-order temperature coefficient of resistance.Based on the k value, we classify the thermistor into two categories:1. Positive Temperature Coefficient (PTC).2. Negative Temperature Coefficient (NTC). The device is called a PTC if the value of k was positive, when that happens, the resistance starts increasing with the temperature, and for the NTC, the resistance starts decreasing with an increasing temperature.Thermistors differ from the Resistance Temperature detectors in the material that they are made of, which is generally ceramic or polymer, while RTD uses pure metals; another difference is in the temperature response, as RTD tends to be useful over large temperature ranges, while thermistors work on a limited temperature range, usually between -90C and 130C.Some of the disadvantages of using the thermistors is that it is quite fragile compared to RTD or thermocouples, that is why it should be mounted safely to avoid crushing or bond separation, and since they are made of semiconductors, Thermistors are subject to permanent decalibration at high temperatures rather than RTDs, which brings us to the last disadvantage which is the limited temperature possible to use, which varies from -90C and 130C.References:Wikipedia, Thermistors, 2010, 30 Oct 2010