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How the resistance of a thermistor changes with temperature keeping the current constant and recording the voltage as the temperature changes.
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| Submitted: Mon Nov 10 2003
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My Aims I aim to find how the resistance of a thermistor changes with temperature keeping the current constant and recording the voltage as the temperature changes. I will then record this data and try to explain it using scientific knowledge and detailed reasoning. Background information - Thermistors Thermistors are thermally sensitive resistors and have, according to type, a negative (NTC), or positive (PTC) temperature coefficient. They work because at low temperatures, electrons are fixed onto atoms and so cannot move. As the electrons get hotter they receive enough energy to escape from their atoms, so the thermistor becomes a better conductor. Materials that react like this are called semiconductors. Carbon, silicon are two materials whose resistance decreases as they get hotter. Thermistors can be used for the following functions: * Temperature sensing, switching at temperatures ranging from 60°C to 180°C, e.g. protection of windings in electric motors and transformers. * Solid state fuse...
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