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Physics Coursework Aim: To test how a thermistor reacts to temperature. Also how the results compare to the manufacturers. Background Knowledge: Thermistors are inexpensive, easy to obtain temperature sensors. They are easy to use and can be used in a variety of ways. Circuits with thermistors can have reasonable output voltages but not the millivolt outputs thermocouples have. Because of these qualities, thermistors are widely used for simple temperature measurements. They are not normally used for high temperatures, but in the temperature ranges where they work they are widely used. Thermistors are made from silicon normally so we must understand silicon and its properties. Carbon, silicon and germanium (germanium, like silicon, is also a semiconductor) have a unique property in their electron structure namely each has four electrons in its outer orbital. This allows them to form crystals. The four electrons form perfect covalent bonds with four neighbouring atoms, creating a lattice. In...

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