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My prediction for this experiment is that the longer the length of the wire, the higher the resistance and the shorter the length of the wire, the lower the resistance.

Extracts from this document...

Introduction

Samirul Hasan

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Science Coursework – Electricity:

Resistance

Introduction:

In this experiment I am going to investigate the length of a wire.

Prediction:

My prediction for this experiment is that the longer the length of the wire, the higher the resistance and the shorter the length of the wire, the lower the resistance.

What Will I Change?

The only thing I will change in this experiment is the length of the wire.

What Will I Keep The Same?

The things I will keep the same in this experiment are the thickness of the wire, temperature of the wire and also the number of batteries used.

Preliminary Work

Apparatus List:

  • 2 leads
  • 2 crocodile clips
  • 1 ruler and wire
  • I multimeter
...read more.

Middle

16.03

100

19

18.9

19

19

To find the average resistance, the equation I used was:

Average = Resistance Test 1 + Resistance Test 2 + Resistance Test 3

                                                     3

Apparatus List:image03.png

  • 5 leads
  • 2 crocodile clips
  • 1 set of batteries
  • 1 voltmeter
  • 1 ammeter
  • 1 ruler with wire

Method:

First we collected the leads and then connected then to the set of batteries. The leads, on the positive side of the battery, were linked up so it goes through the voltmeter and the leads on the negative side of the battery were linked up so they go through the ammeter. When this was done crocodile clips were fixed onto the each end of the lead on the positive and negative side.

...read more.

Conclusion

Resistance Test 1 + Resistance Test 2 + Resistance Test 3

                                                                     3

Conclusion:

My results of my experiment show that as the length of the wire increases, the resistance will increase and as the length of the wire decreases, the resistance decreases, therefore my results agree with my original prediction.

Evaluation:

In my graphs, there were 1 or 2 measurements that stood out. This was due to the non- accurate measurement of the wire.

 I think that my results and graphs are reliable because they were not taken falsely. They were recorded while the experiment was in process therefore any recording that appeared or the meters were written down.

I could of improved my experiment by having  longer wire so therefore I could have more and more accurate results.

...read more.

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Response to the question

The response to the question is adequate. The candidate carries out the experiment accurately and proves that their prediction is correct. The candidate lacks anything to make their work stand out though. The main thing the candidate should improve is ...

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Response to the question

The response to the question is adequate. The candidate carries out the experiment accurately and proves that their prediction is correct. The candidate lacks anything to make their work stand out though. The main thing the candidate should improve is the scientific reasons behind their work as this is not shown at any stage. For now it seems like the candidate robotically followed a method to get an answer without any scientific thought involved.

Level of analysis

The candidate sets out what they are going to do concisely and make an accurate prediction for the later experiment. What the candidate fails to do is explain the scientific reasoning behind their hypothesis or why they are keeping certain factors such as temperature the same. If the candidate was to include scientific reasoning, this would indicate a deeper understanding of the topic and show that they understand the concepts for why they are actually carrying out the experiment. The candidate carries out preliminary work which is good to ascertain if their method of working is correct, but their results are extensive and I'm not sure this is needed as the idea of preliminary tests are just to get an idea of how to actually carry out the experiment. In this, their method presented is not clear, and their is no diagram included so it is hard to follow what the candidate actually did, and why they changed their method for the actual experiment is not included. This should have been better done as it would have shown better understanding that the candidate lacked in the first place. The method in the actual experiment is outlined in continuous prose. The information would have been presented clearer and been easier to read with bullet points. The candidate is also wrong is thinking there is any significant anomalous results. Their evaluation is not very well rounded as they do not consider many problems or solutions, they do not explain the science behind their results at any stage and do not seem to understand the concept of 'reliable.' This is not due to the results being taken unfalsely.

Quality of writing

Minor grammatical errors in places, but most spelling, grammar and punctuation fine. The layout of the essay is good with concise text and clear subheadings, but the methods in both instances should have been set out in bullet points.


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Reviewed by skatealexia 10/07/2012

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