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The aim of this investigation is to find out what happens to the resistance of a wire when the length of a Nichrome wire is increased.

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The aim of this investigation is to find out what happens to the resistance of a wire when the length of a Nichrome wire is increased.

What is Resistance?

Resistance is the force, which withstands the flow of an electric current around a complete circuit, so that energy is required to push the charged particles around the circuit.

 Resistance only occurs when electrons travelling through a wire, collide with the atoms inside the wire. These collisions between the electrons and the atoms try to resist the flow of electrons through the wire, which then causes resistance. Resistance is a measure of how difficult it is to transfer the electrons through the wire.

We measure resistance by using the following equation:




    If the length of a wire increases, then the resistance should increase as well because; the electrons in the wire will have to travel a further distance so this means that there will be more collisions that will occur.

The main factors that can affect the resistance of a wire are: -  

  1. The length of the wire.

If the length of the wire increases, then the resistance will also increase. This is because the electrons have to travel a further distance, so this will result in a more number of collisions to occur.

   2.  Diameter or the thickness of a wire.

...read more.


Nichrome wire 26 (SWG) Standard Wire GageVoltmeter Ammeter Connecting WiresRuler


  1. First I will set up the experiment as shown in the diagram above.
  2. Next I will get some wire, measure it to 5cm, then cut it with scissors and connect it to the crocodile clips.
  3. Switch on the power pack
  4. Now, I will record the reading from the ammeter and voltmeter, and write it in my table.
  5. I will repeat the experiment with lengths of 10, 15, 20, 25, 30cms of wire.
  6. I will
...read more.


  • Use pointers instead of crocodile clips, to make it more easy to clip it onto the wire and more accurate to measure the distance.

  The graph I have drawn seems to be quite reliable because, even though there are five anomalous points. They are close to the graph and are just located outside the line of Best fit.

   In the experiment I noticed that the ammeter and voltmeter flickered between a decimal point, so therefore, it could not present a precise final reading. So this means that the person noting down the readings could not be sure if his average result was correct.

  During the experiment I did not keep a constant room temperature as this is not possible, therefore this could have made the wire become hotter more easily and more quickly. If this happened it would result in an unfair test, which would make my results not accurate enough. If future experiments I could have made changes by discovering a way to keep the surrounding temperature constant to make it a fair test.

    All of this account further to my knowledge that my graph is quite reliable, changes could have been made if I was to repeat the experiment more times with the same lengths of wire.

     I think that all the modifications I have noted above about improving my experiment and making the anomalous point more accurate, is quite high-quality information to be including in my evaluation and therefore these could be included if the experiment was to be a done another time.

...read more.

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