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An Experiment to find out how the length of wire effects resistance.

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By Kayleigh Timms 10I

 An Experiment to find out how the length

of wire effects resistance.

In this experiment we are trying to find out if by changing the length of a piece of wire its affects the resistance of current. I will find this out by having a piece of wood with a piece of wire stretching along the wood. I will have a power box on connected to an ammeter and voltage meter and then these connected to the piece of wire using crocodile clips. The variable I’m going to change will be the length of wire. We can have the wire from the length of 1cm up to 100 cm’s long. We can use the crocodile clips to make the wire long or short.  The equipment I will use is:

  • Crocodile clips
  • Power Pack
  • Wires
  • Variable resister
  • Ammeter
  • Voltage Meter
  • Wood with a piece of wire clipped onto it

I chose the equipment I have because I think that it will be the best to use this so it will measure it accurately and give good results. To measure the Variable which I’m changing I will have a piece of wood with measurements written onto it so I can use it to mark where I have to put the crocodile clips so it is a accurate measurement. The variable I’m trying to measure is the resistance. The resistance is a current that flows through the wire when there is a current running through it, I will have an ammeter and a voltage meter to read the resistance.

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Length Of Wire (cm)

Current (a)

Voltage (v)


0 – 40 cm




0 – 50 cm




0 – 80 cm




0 – 100 cm




The results above are the set from my primarily test. It shows all the results vary, there could be something I have done wrong. The current and voltage are in the same decimal place but the resistance shows they can vary. This might so a variable have changed that I haven’t controlled. In my set of results from where I do four separate

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If I ever did my test again then I could improve it many ways. I could have more time so I can do it a bit more slowly so I can get accurate result for each test. I could also make sure the wires the same length and this would make it fairer and maybe give me a different set of results that were clear and that had a pattern. I could also make sure that the temperature of the wires and power box etc stayed the same throughout the tests I did. I would start by making sure the crocodile clips were put on the wire with accuracy so they didn’t slide up or down the wire when I was making the readings. I would use a different variable that I could place the wire onto that I could also write the measurements like 10 cm and 20 cm onto, I could use a rule instead of writing it onto the wood.

My conclusion after I have done this experiment is that a lot of simple things can change the state of resistance everytime you do the test. You would have to have everything clipped to one another with different variables to make it a really accurate test then you even might have a few things that will make a few odd results on a graph.

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