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How the resistance of a thermister is affected by different temperatures.

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Introduction

How the resistance of a thermister is affected by different temperatures Aim To investigate whether different temperatures effect the resistance of a themister. Prediction I predict that when the temperature of water is higher the voltage becomes larger but the milliamps become lower as temperature increases I believe this because thermisters are semi conductors this means the resistance of the material gets less as it gets hotter. Because a temperature is usually made from a material which is a good electrical conductor when it is hot. ...read more.

Middle

I will do this 6 times to do 6 different temperatures 80c, 70c, 60c, 50c, 40c and 30 I will take my readings from the ammeter to give me the current readings and from the volt meter to get the voltage. I will do this 3 times for each temperature so I can work out an average to give a more accurate result. I will show my results in a table and look for a pattern. Control Variables Things that need to be taken into consideration are; Results TEMP CURRENT (A) ...read more.

Conclusion

25.6 / 25.7 25.9 2.5 / 2.7 / 2.8 2.6 Conclusion From this experiment I found that the resistance decreases as the temperature increases as I predicted. From my graph I can see that the thermistors resistance drops a lot from room temperature and then steadily declines as the line of best fit shows that there are no anomalous results apart from the first one at 30c. this is probably because it took time for the thermister to respond to the heat. I have worked out that the following equation is how to work out the resistance. Resistance = voltage - Current V -- = R I ...read more.

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