• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13

Find out whether a longer wire or a shorter wire will have more or less current flowing through the wires.

Extracts from this document...


Name: Amritpal Singh Sahota                                  Candidate number: 9723





In this investigation, I am trying to find out whether a longer wire or a shorter wire will have more or less current flowing through the wires.


  1. Thickness Of The Wire

Resistance can be affected by the different thickness of wires. The thicker the wire, then there is less atom to block the path of the electrons and this means that there will be less resistance. However if the wire is thinner then there will be the same number of atoms but fewer electrons will be able to pass through the wire.

Therefore this means that there will be an increase in resistance. The reason due to this is that a thicker wire has more space around the atoms to allow electrons to pass. But in a thinner wire it will be the complete opposite.

This is for a Thick wire                   This is for a Thin wireimage08.pngimage05.png






  1. Length Of The Wire.

The length of the wire is a variable, in which when a longer wire is present the resistance is higher. This is because there are more atoms present, which are in the way of the electrons. They are evenly spread out. However if a shorter wire is present the wire has fewer atoms, which means that the electrons can move more freely.

                                                                 Long Wireimage01.pngimage01.pngimage01.pngimage01.pngimage01.png


                                Short Wire              image05.png

  1. Temperature

Temperature is also a variable for resistance. When a filament lamp is turned on, the heating of the current causes the temperature of the filament lamp to rise very rapidly.

...read more.





In my prediction I predict that the longer the wire the higher the resistance. The current will also be lower. However the lower the resistance the higher the current will be present in the wire. I think this because the current will have to flow through a longer distance and therefore it causes a higher rate of resistance. This is due to the force being pushed and travelled a longer way. If I double the length of the wire, the resistance will also double, which makes the current halve, also that if the current doubles, the resistance haves.


The reason why I think this will happen is because in the wire the electrons will be able to get passed more freely. This is shown in the diagram below.



        Electrons                        Atoms

(I) Current is what flows on a wire or a conductor like water flowing down a river. Current flows from points of high voltage to points of low voltage on the surface of a conductor. Current is measured in (A) Amperes or Amps.

(V) Voltage is the difference in electrical potential between two points in a circuit. It’s the push or pressure behind current flow and through a circuit, and is measured in volts (V).

(R) Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistor allows a small amount of flow. Resistance is measured in ohms. As the resistance is increased so will the current.



...read more.


I think that the results I had taken was not enough to say what I found was true, because if I had taken the length into more consideration for e.g. going up in 5’s, I would have gathered more and precise results. I also think that considering that I done this experiment in year 9 we could have thought, that we would achieve more precise results if I had gone up in 5’s.

From this I think I could have got even more precise results. The anomalous results that I found was on graph’s 4 - 10 the reason why I think this is because of the variables that are the thickness of the wire, the materials of the wire, the length o the wire and the temperature. I think that I could say that my method is reliable and that someone off the street can follow my method.

In order to extend this work I could have carried out the same experiment but change the lengths of the wires from 10, 20, 30- 100cms. To 5, 10, 15, 20-100cms (so basically increasing in 5cm at each interval). I could also improve this and extend this by using different thickness of wires. Also by using different metal materials. This is because different metals are either poor conductors or good conductors. On the whole I would consider that my experiment was good enough to which a conclusion good be drawn.


  • Author: Graham Booth
  • Lonsdale Science Revision Guide
  • Author: Mary James
  • www.bbc.co.uk/bitesize

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Electrical & Thermal Physics essays

  1. Finding the Resistivity of a Wire

    measured to one decimal place, my result is exactly as I would have expected, so there is minimal discrepancy between the expected result and the outcome.

  2. Internal resistance investigation - I will conduct the following investigation with the aim to ...

    0.0720 0.0720 106 104 105.0 0.0880 0.0865 0.0873 As you can see, I repeated my experiment 2 times and took an average of the results. This should make my graph more accurate. At this stage, I cannot see any obvious anomalous results.

  1. Investigating the effect of 'length' on the resistance of a wire

    to see which type, diameter of wire and the input current is the best for my investigation to give me a suitable range of current values and so that the results are more reliable, so if there was to be problems then they would be solved before the real experiment.

  2. Investigate the current - voltage relationship for a resistor and filament lamp. To determine ...

    There was not much that could go wrong in the experiment once it was set up accurately and everything was checked to be in working order. The experiment could have been repeated and an average set of results could be made to plot graphs, but I don't think it is necessary and may have just wasted time.

  1. Investigation into the resistance of a filament lamp.

    Prediction: I predict that by increasing the resistance we will also increase the temperature of the filament lamp. Also the filament is not an ohmic conductor. This is because we know that at high temperature the ions have more kinetic energy then they would have if the temperature was low,

  2. Characteristics of Ohmic and non-Ohmic Conductors.

    The readings of current will be taken at intervals of 5 oC as the water is heated. And then again the current will be noted at intervals of 5 oC as it cools. The average of the two currents will then be taken, to ensure that out results are reliable.

  1. An Investigation into how electrons move

    We were unable to remove the Petri dish and so had to clean and dry it as best as possible whilst it was in situ. We had to accept that this may lead to an error but we that we had minimised the error as best we could.

  2. Geothermal energy is not easily accessible with our current technology. Our main focus was ...

    When engineers dig into the earth for a viable energy source, unprecedented amounts of pressure and heat are experienced. Therefore, a drill bit resistant to the extreme conditions is necessary for the endeavor. Most geothermal energy plants utilize heat close to the surface of the Earth.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work