Physics Thermistor Coursework

Physics Thermistor Coursework-29
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.

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In an open circuit the break in the continuity of the circuit prevents current throughout.

All it takes is a single break in continuity to open a circuit.

The response time is the time taken by a sensor to respond to a change in input.

When a sudden temperature change was applied, the bead thermistor was able to respond to it 3 times faster than the thermistor probe, therefore comparatively, its response time is very rapid.

All these devices contain electronic systems and sub-systems, some with simple circuitry, some with very complex circuitry but all with one thing in common, they need a source of electricity to make them work.

This electricity is converted into signals in the equipment which either process (change in some way) information and/or direct its flow from one point to another.

Atoms that we might vaguely remember from our Chemistry lessons make up everything and these in turn are made from electrical particles. The tiniest of these and the ones which move inside wires and electric circuits are called Electrons. or direct current and here the electrons can only flow in one direction through the circuit from out from one pole of the battery, called the negative and back in to another pole of the battery called the positive.

There are subtle differences however between electricity from the mains and a battery of whatever type, wet and containing acid as in car, or dry and containing a special jelly-like material as in say our digital camera. They were very misguided but in their infinite wisdom decreed that D.

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