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Length of wire

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Name: Anuj Kumar   Edexcel Physics Preliminary Coursework     Physics teacher: Miss. Qazi      

Title: Thickness of a wire

Aim: To investigate the effect of the thickness of wire on resistance.

Prediction: I predict that as the thickness of wire increases, resistance decreases.

Scientific Explanation: This is because in a thicker wire there is more space for the electron to flow through so the electrons have to struggle less to pass through the ions.

In a thin wire, there is very little                  In the thicker wire, there is less

space for the electrons so the                    struggle for space (as there is more

electrons have to struggle more                 space for the electrons to flow through)  

among themselves causing more              so there is less resistance.



Apparatus: Power pack, variable resistor, Voltmeter, Ammeter, ruler, wires of different thickness, Copper Wires, croc clips


  1. Check that the ammeter and the voltmeter are working properly by creating a simple circuit.
  2. Set up the apparatus as shown in the diagram connecting each of the apparatus using the croc clips.
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Length of wire

Material the wire is made from


Measurements: There are only 2 measurements that need to be measured during this experiment and they are the measurements of the current and the voltage.

Fair Test: To make it a fair test, every measurement taken should be done accurately. I am going to keep the voltage produced by the power pack the same because to test the effect of length of wire on resistance, the initial voltage will have to be the same to make it a fair test. I will also use the same voltmeter to make sure that the results come out with a pattern as other voltmeters may show a higher reading compared to the voltmeter I am using for this experiment. The same goes for the ammeter. I will also keep the variable resistor the same because other variable resistors might be more powerful or weaker compared to the variable resistor I am using for this experiment. That will also maintain a fair test.

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Conclusion: By looking at the graph and the line of best fit, I can conclude that as the thickness of the wire increases, the resistance decreases. By looking at the graph, I can also tell that if the thickness is 22, the resistance is 9.25. If the thickness is 24, the resistance is 11.38(and the graph curve goes on).  

Link Statement: The apparatus and the methods in this experiment stay the same. We will be keeping the voltage and the current the same. The only thing that we will be changing is the thickness of the wire. Now, that found an effect on resistance by changing the thickness, we will keep the thickness the same in the main experiment. This will help me in the main experiment to make sure to keep the thickness the same to analyze the effect of length of wire on resistance.  

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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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