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An Investigation Into The Factors Affecting The Temperature Rise of Water Heated Electronically

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Introduction

An Investigation Into The Factors Affecting The Temperature Rise of Water Heated Electronically Plan In this experiment I am trying to find out, how different factors affect the temperature rise when heated electronically. Variables In this experiment the key variables I am considering are: * Time (t)(s) * Power (IV)(W) * Mass of water (M) (g) * Change of temperature (?t) (oC) The variables that are fixed must remain the same in order to attain an accurate conclusion, if they were not it would make the experiment void. Any 2 variables can be varied but the other 2 must be held fixed. I have a choice in what factors will be fixed or varied either: 1. Power and time are fixed, whilst mass and change it temperature remain varied. E.g. I would put a fixed power for a fixed time and see how the change in temperature relates experimentally to the mass of the water. 2. Mass and time are fixed, whilst power and change in temperature vary. E.g. I would see how the power input and change in temperature relate to each other. 3. Power and mass are fixed, whilst time and change in temperature vary. E.g. I would have a fixed power input and mass, in order to see how both factors relate to one another. Preliminary experiment In my preliminary experiment, I have chosen to investigate two different factors; these are keeping the mass and time fixed, and keeping the power and mass fixed. In the preliminary experiment I am aiming to find out the most suitable independent factors to use in the actual experiment. As well as this I am trying to find out the most suitable volumes of water to use, so the experiment does not take too long or too slow to make an accurate evaluation. ...read more.

Middle

0 20 0 300 32 12 600 43.5 23.5 0 20 0 300 31 11 600 43 23 0 20 0 300 32 12 600 43.5 23.5 30 21 1 330 33 13 30 23 3 330 32 12 30 22 2 330 33 13 60 24 4 360 34 14 60 23 3 360 34 14 60 23 3 360 33.5 13.5 90 25 5 390 35 15 90 24.5 4.5 390 34.5 14.5 90 24 4 390 34.5 14.5 120 25 5 420 36.5 16.5 120 24.5 4.5 420 35.5 15.5 120 25 5 420 35 15 150 25.5 5.5 450 37 17 150 26 6 450 37 17 150 26 6 450 36.5 16.5 180 27 7 480 39 19 180 27 7 480 38.5 18.5 180 26.5 6.5 480 38 18 210 28 8 510 40 20 210 28 8 510 40 20 210 27.5 7.5 510 39.5 19.5 240 29.5 9.5 540 41.5 21.5 240 29 9 540 41 21 240 29 9 540 41 21 270 30.5 10.5 570 43 23 270 30.5 10.5 570 42.5 22.5 270 31 11 570 42 22 Average Time (s) Average Change in Temperature (0C) Time (s) Average Change in Temperature (0C) 0 0 330 12.6 30 2 360 13.8 60 3.3 390 14.7 90 4.5 420 15.7 120 4.8 450 16.8 150 5.8 480 18.5 180 6.8 510 19.8 210 7.8 540 21.2 240 9.2 570 22.5 270 10.7 600 23.3 300 11.6 Experiment 2: Keeping the mass and time fixed Power (IV) Temperature (oC) Change in Temperature (oC) Volts (V) Current (Amps) 0.8 23.5 1.5 1 0.8 0.8 23 1 1 0.8 0.8 24.5 2.5 1 0.8 2.6 25.5 3.5 2 1.3 2.6 25 3 2 1.3 2.6 26 4 2 1.3 5.7 28 6 ...read more.

Conclusion

I will also extend the 2nd experiment by seeing if the relationship between power and the change in temperature carries on as I raise the power to above 15 W. I could also see how a change in the mass of water affects the temperature rise. For example if I used a high water mass it would take longer as there are more water molecules to heat than a small water mass. Looking at the graphs, the 1st experiment shows very accurate results while the results in the 2nd experiment are more varied. Though during this experiment I found there to be no anomalies. There are many reason for this inconsistency in the 2nd experiment, the main reason I feel is that the amount of water used was slightly higher than it should have been, and this small error has affected the results. Other reasons for these results could be caused by heat loss to the air, heat lost by the cup, stirring the water, and impurities in the water. Even though there are many reasons for results to be inaccurate, I believe that the results I have gained are quite reliable and accurate enough to support my conclusion, since there are no obvious anomalies. To extend this experiment I could test the effect of varying the mass of the water, whilst heating it. As well as this I could conduct the same experiment varying the time, on distilled water and tap water. In this way I will be able to find out how impurities in the water affect the results by comparing it to an experiment using normal tap water. This would provide an interesting experiment that would further improve the accuracy of my conclusion. Mihir Desai Physics Coursework ...read more.

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