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Resistance of Thermistors Introduction: Resistance is a force which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. The circuit itself can resist the flow of particles if the wires are either very thin or very long. E.g. the filament across an electric bulb is quite thin as needs to resist the flow of particles for the bulb to glow. Whenever current flows through a resistance it gives off heat. This idea is used in the filament of a light bulb; it is also used in the heating elements of appliances such as toasters and kettles. These elements normal contain nichrome wire. Resistance is measured in ohms. A thermistors resistance is high when cold and low when hot. If voltage doubles, current will also double, and so on, Voltage divided by the current always has the same value. George Ohm...

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