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Physics coursework : temperature change of water heated with an immersion heater

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Introduction

Physics coursework : temperature change of water heated with an immersion heater Planning I am going to investigate the temperature change of water heated with an immersion heater. The following variables are going to be kept constant throughout the investigation. Amount of water in the beaker Length of the coil Room temperature Voltage The variable I am going to investigate is how long the heater will be heated for. I am going to record the temperature of the water every two minutes for twenty minutes. I am going to repeat this test three times so that I will be able to get an average reading and improve the reliability of my results. To ensure that my investigation will be fair, I am going to use the same equipment throughout the experiment. I am going to keep all of the variables constant except time. I am going to keep the voltage and the current the same during the investigation. I am going to make sure that I use the same amount of water throughout the experiment. To make sure my experiment will be accurate, I am going to use suitable equipment and carefully record my results in sensible units. ...read more.

Middle

25.5 24 25 24.8 4 29.5 29 30 29.5 6 33 33 34 33.3 8 36 36 37 36.3 10 39 40 41 40 12 42 42 42.5 42.2 14 44 44 44 44 16 46 46.5 47 46.5 18 48 48.5 49 48.5 20 50 50.5 51 50.5 Analysis I drew a graph to show the average temperature change. From looking at my graph I can see that as time increases the temperature increases. Looking at the graph I used to predict my results, I can see that the predicted results are fairly similar to the results I obtained from my experiment. However the graph I used to predict my results is a straight line whereas the graph I used to show my results has a gentle curve. The highest temperature reached in the prediction graph was 75 degrees Celsius, whereas the highest temperature from my actual results was 50.5 degrees Celsius. This is because the results that I predicted were only for an experiment where no energy escapes from the water; this is why on my predicted graph the temperature is much greater. ...read more.

Conclusion

I could have also used different equipment that would have made my experiment more accurate. For example, I could have used an insulation beaker; this would have meant that less heat escaped from the beaker. I could have also used more precise ammeters and voltmeters. The graph that shows my predicted results shows that the increase in time is proportional to the increase in time. However the graph showing my actual results does not show this as the graph is a curve. This means that my results do not back up my original hypothesis, however the results I did obtain show that as the amount of time increased so did the temperature. The graph showing my results shows that the longer the water is heated for the more the temperature increases. However looking at my graph the results show a curve. Eventually this curve will straighten out showing that the temperature cannot increase anymore. To extend my experiment I could have heated the water for longer to see if the temperature change would have become less. If I was given more time I could have investigated other variables such as the amount of water in the beaker and the voltage. I could have changed these to see the effect they would have on the temperature change. Kate Robinson 11HC ...read more.

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