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In my physics lessons I will be investigating what effects the speed of heating water when heated by an immersion heater.

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Introduction

Physics Introduction In my physics lessons I will be investigating what effects the speed of heating water when heated by an immersion heater. For the investigation I have to take into account the following, but only one of them I am able to change. Type of container, Type of liquid (substance in container), Amount of water, length of coil and voltage applied. All these variables will have different affects on the speed in which the immersion heater is able to heat the water. But what I already know is that heat can pass through water by convection. Convection current works when an atom or molecule is given energy to vibrate or move around, they eventually spread apart and escape from the colder liquid becoming less dense. This is why the warmer and more energetic atom rises throughout the liquid giving energy to surrounding atoms or water molecules. If this atom has enough energy it is able to escape from the liquid turning into a vapor, but soon the hot particle will eventually cool and sink, this is called convection current. Decision The variable that I have chosen to change is the amount of water I will do this by measuring specific amounts using a measuring cylinder. ...read more.

Middle

Also I will be using the same apparatus for the experiment right the way through by storing my equipment in a safe place, so the wires, power source and test tube is always the same. Each reading that we take from the thermometer will be taken at eye level with one person either side of the thermometer so that the results are seen more clearly. This is more likely to keep the results accurate. We will repeat each set of results 3 times and give each set an average so then if we notice any errors they can be corrected and we are left with more reliable. Diagram To try and keep this experiment as accurate as possible I am going to try and keep the voltmeter and ammeter to certain values: *Voltmeter: 5Volts. *Ammeter: 2.5 Amps. From my trial experiment I noticed that the voltage applied to heat up the water will have to be high enough to make an impact on the immersion heater so it can provide enough heat to the surrounding cold water. If there isn't enough energy supplied then the immersion heater doesn't warm up quickly enough to show a range of results after the 5minutes. ...read more.

Conclusion

The experiment could have been also been improved by using a MultiMate that is hi-tech equipment that will give me more accurate readings because it is able to work out readings at 1 or 2 decimal places. We carried out the experiment in a typical way there were no computers or special equipment used so we had to mostly rely on out eyes and reaction times so this is not reliable considering reaction times aren't spot on. But I used my reaction time for all of them so it makes it a fair test. If I was to do the experiment again I would use one type of computer equipment called "digital thermometer" because it shows accurate readings to 1 or 2 decimal places and stops the person from having to look at it from eye level, considering it has a LCD screen. The results could have been kept more accurate also by adding some sort of silvery material (foil) around the outside and top of the test tube to make improvements. This would reflect the heat that is escaping by convection and so the heat wouldn't be lost. Also the average results that I gathered had no faults or errors so they are accurate and reliable as possible, each result was very close to the line of best fit, none of the results are floating away from the line. ...read more.

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