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Temperature coefficient resistance of a thermistor.

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Introduction

Physics Coursework Data handling Temperature coefficient resistance of a thermistor Experiment The aim of the experiment is to find out how much the resistance in a thermistor changes as the temperature of the thermistor and its surroundings changes. To do this the thermistor will be placed in a beaker of water with a thermometer and the temperature of the water raised, the thermistor will be attached to a meter to measure the resistance. At regular intervals the temperature of the water will be taken and at the same time the resistance will be taken. This will show if the resistance of a thermistor increases or decreases as the temperature increases. Apparatus: For this experiment I will need: * A thermistor * A beaker (containing water) ...read more.

Middle

99 53 65 144 100 51 68 138 Graph: Conclusion and evaluation: From the graph it is possible to see that the resistance of the thermistor decreases as the temperature increases, at a lower temperature the resistance is up to nearly 600ohms and a much higher temperature the resistance has dropped to only 50ohms. This means that the temperature of a thermistor is proportional to the resistance. As there where anomalies in the graph the results might have been inaccurate, these are some of the ways that I thought the experiment and the results could have been inaccurate and how I would have improved on these points in the future if I were to do this experiment again. ...read more.

Conclusion

The way that I could overcome this problem in the future would be to use water baths set to a certain temperature and take several readings in order to gain an average and then move on the next temperature. Would mean that the temperature would not me changing as much and the resistance reading would be mush more accurate. * When I had the thermistor in the water bath (beaker) I did not stir the water, this meant that the water was different temperature in different parts of the water, meaning the temperature of where the thermistor was in the beaker could have been different to the temperature of where the thermometer was in the beakers, meaning the resistance reading that I took was not the correct one for the temperature that show up on the thermometer, this would also have made my results inaccurate. ...read more.

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