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An investigation on the current of a wire

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An investigation on the current of a wire



In this investigation I aim to find out whether the length of a wire affects the current of a wire.

Equipment List:

· Power Pack

· Wires (3 different thicknesses: thick, medium and thin)

· Crocodile clips

· Wooden board

· Ammeter


  1. Set up a circuit with a battery and an ammeter as shown in the diagram below.


                                                                                       = Battery cellsimage01.png

                                                                                       = Crocodile clips

                                                                                       = Ammeterimage02.pngimage01.pngimage03.pngimage03.png


  1. Get a wooden board with three wires made of the same metal and of the same total length but with different thicknesses; thick, medium and thin.


   In cm                                                                                                               image05.png

                                                                                                                   Wooden image08.pngimage07.pngimage06.png



...read more.








  1. Each time I move the second crocodile clip I will record the number on the ammeter telling me the strength of the current.  I will repeat this with the every wire; thick, medium and thin and then repeat the whole experiment another two times.  I will record my results in a table and then also do an average results table.

5.  I will then record my results in a table like this:

                                                          CURRENT (AMPS)





Preliminary Experiment

I carried out a preliminary experiment to see the other factors that could affect the experiment and also to see if I could improve any of the steps in the method. This showed that the wire was very weak if given more than 5 volts because the wire lets electricity flow faster and faster which then leads to the heat eventually breaking the wire. I found that if I decreased the voltage to a reading of 2 volts the wire stayed in tact enough to give a good reading and thereby giving better overall results.

Fair test

These are the things I will do in order to make my experiment a fair test:

  1. Keep the voltage the same throughout the experiment (2volts)
  2. Use the same wires when repeating the experiment
  3.      Making sure that the battery pack is switched on and off after every reading.


I predict that the thicker the wire the higher the current.

...read more.


The graph showed that there was one anomalous result in the medium wire, which did not fit the rest of the pattern.  This error could be down to the measurement of the wire or a temperature rise. Measuring the length of the wire is an inaccuracy because the rulers used on the meter bridges are not exact, and it is difficult to get an accurate reading of length by eye, as the wire might not be completely straight or it may be of different thickness throughout the length.

My results would be difficult to improve on as they were very accurate, and there was only one anomalous results. But if I were to do the experiment again I would use a more accurate method of measurement and take a much wider range of readings and more readings so that a more accurate average can be taken.

I would also investigate other factors, such as temperature, thickness, and material to see how these effect current. I would also do the experiment under different conditions such as temperature and pressure to see if they make any difference to the current and resistance.

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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