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An investigation into the efficiency of an immersion heater 2

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Introduction

An investigation into the efficiency of an immersion heater Introduction: An emersion heater is primarily used to heat water. It does this by using electrical power and converting it into heat energy. The amount of energy supplied to the emersion heater will be worked out using the formula: Voltage Current Time. The heat gained by the water was calculated by using the formula: Mass of water Specific heat Temperature change. This will then be used to calculate the efficiency of the heater. Efficiency is how good the item being tested is at retaining energy: The ratio of the energy delivered by a machine to the energy supplied for its operation determines the items efficiency.

Middle

am using as well as the S.W.G of the wires but not the length of the wire so as to get a variety of results ands therefore see what wire is more efficient to use in the immersion heater. Results: Below are the tables of the results I got once I had carried out the experiment. Constantan 28 S.W.G Length Voltage (v) Amps (c) Time in water Electrical energy Initial temp (oC) Final temp (oC) Temp change (oC) 40cm 9.30 4.30 2 minutes 4798.8 23 35 12 Nickel chrome 28 S.W.G Length Voltage (v) Amps (c) Time in water Electrical energy Initial temp (oC)

Conclusion

as you are producing other types of energy which you don't need and therefore have no use for and are wasted. I also concluded that by using constantan wire is more efficient than nickel chrome wire. I also found out that carbon wire is not a good type of wire to use as it burned out too quickly. Things that I would change about this experiment if I was to do it again would be that I would try more types of wires and a different variety of S.W.G s as there weren't many different types of S.W.G s available at the science lab. ?? ?? ?? ?? Page: 2 Mohamed Hassan student no: 20042512

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Here's what a teacher thought of this essay

3 star(s)

This report has an appropriate structure and the language used is good.
1. The plan is missing several sections including a variables and safety section.
2. The conclusion is very brief and does not use the data to back up the claim.
3. The report is missing an evaluation section.
***

Marked by teacher Luke Smithen 05/09/2013

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