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How does the length of a wire effect it’s resistance.

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Ross Horn

How Does the Length of a Wire Effect It’s Resistance


I think that the length of a wire will affect its resistance. I think that the longer the wire the more resistance it will have and the shorter the wire the smaller the resistance. I think this because the electrons will be slowed down more by having to go through more electrons to get round the circuit.


  • One Meter Ruler
  • Voltmeter
  • Ammeter
  • Crocodile Clips
  • Power Pack
  • Un-insulated wire

Fair Test

To make this a fair test I will use the same power pack, voltmeter and ammeter. Also I will use the same un-insulated wire in all the recordings of the results. I will use the same crocodile clips as well. Also I will make sure the wire doesn’t overheat which affects the resistance.


  • I will setup the apparatus as shown below in the diagram


  • I will then place the crocodile clip at 600mm on the un-insulated wire
  • Then I will turn on the power pack to a set voltage
  • Then I will record the volts, shown on the voltmeter and the amps, shown on the ammeter, onto a table of results
  • Then I will decrease the voltage by a set amount then record the volts and amps of that circuit then repeat this step again so I have three sets of results
  • I will repeat the last four steps for these lengths of wire. 500mm, 400mm, 300mm, 200mm and 100mm.
  • I will then record my results in neat and work out the resistance for each set of results (totalling 18 sets of voltage and current) by using the R=V÷I formula
  • Then, using the resistance I worked out, I will find the average resistance for each length of wire
...read more.



As you can see, in this thinner wire, the protons and electrons are closer together making them collide more and increase the resistance of the wire. What a wire is made of will affect its resistance. Since plastic is an insulator it’s resistance is very high. This would not make a good wire because of its high resistance. Copper is a conductor and will let electricity flow through it very easily; this is because it has a low resistance. Also the temperature of a wire makes a difference to how high or low a wires resistance is. If the wire is hot its resistance increases. If a wires temperature decreases then its resistance will as well.


To present my finding I have decided to show them in two forms.

...read more.


Further work I could do for this investigating would be how the width of a wire affects the resistance. I wrote a few sentences on it earlier but and investigation on it would be more work I could do on this investigation. Also what the wire is made of can affect its resistance so I could plan an investigation on how different metals and materials have a different resistance. Also heating or cooling down a wire can increase and decrease that wires resistance. I have written some information on all these three earlier and can serve as a simple hypothesis for these three new investigations

...read more.

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