• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigate factors affecting the resistance of a wire.

Extracts from this document...


Dino Sabnani                                 Physics Coursework                20th September 03


To investigate factors affecting the resistance of a wire.  There are a plenty of things I can alter which will change the resistance of a wire such as the voltage/ length of the wire, the thickness of the wire and the temperature of the wire.  Most of these are quite impossible to change.  However an easy one in which we can alter easily and receive accurate results would be the length of the wire.  The things in which I will control will be things such as the thickness of the wire, material and voltage or current. I have picked Constantan as the wire for this investigation.  You will see later in the preliminary work why I have chosen this material.


After doing some research and using some scientific knowledge.  I have come to a conclusion that an increase in the length of wire is an increase in resistance.

        Electrons carry charge. But the charge each electron carries is extremely low. So there are millions and millions of electrons flowing through a circuit. More electrons per second mean more current. The current is calculated by image00.pngimage01.png.I equals current, Q is charge and T is time.

When the length of the wire increases, the electrons will have to pass through more and more atoms in the wire.  More collisions will happen, this means that there will be more electrons bumping through the atoms in the wire.

...read more.




















































As we can see from the experiment our experiment will work because the current passing through each of the wire is increasing as the length of the wire is shortened.

For my experiment I will use Constantan,  This is because it gave me the widest

...read more.


Comment of the overall experiment-

Overall, I feel that the experiment was done in a quite good state.  Yes there were 1 or 2 anomalous results; however the line of best fit still turned out as expected.  10 results is good enough for us to draw a decent and accurate line.  All in all most points lie very closely to the line of best fit.  The line is quite reliable as it turned out as expected (i.e. it matches my prediction) and it also matches the research I had done previously.  It shows us a general pattern of the length of wire and resistance being proportional.

Things I could have done better-

The experiment could have been done much more accurately.  I could have used a more reliable ammeter and voltmeter so readings can be more accurate, they can be more stable and corrected to more decimal places, in this case there will be fewer errors in the graph.  We could also have used fewer wires.  The wires we use have a very slight resistance, therefore affecting the experiment slightly.  

Besides all this there is not much else we could have done.  The experiment could have turned out better if the equipment used was much more advanced (explained above).  However as said earlier the results are good enough to show me a general pattern and allow me to analyse what happens.

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism 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 GCSE Electricity and Magnetism essays

  1. Physics GCSE Coursework:Factors affecting the resistance of a wire

    The range of cross-sectional areas that I will be using will be, 26 SWG, 28 SWG, 34 SWG, and 38 SWG. After much calculation, I have worked out that they have the following cross-sectional areas (A = Cross-sectional area). This was achieved by using the equation for cross-sectional area which is: A = ?(1/2D)� SWG Diameter (mm)

  2. The aim of this investigation is to investigate the factors affecting the resistance of ...

    against current (I). The results gave a straight line through the origin (O). This shows that the current is directly proportional to the voltage because the temperature is constant. Such conductors are called ohmic or linear conductors. The resistance of an ohmic conductor therefore does not change when the voltage does.

  1. Discover the factors affecting resistance in a conductor.

    Set the multimeter to ___________ 4) Attach the other ends of these two leads to either end of the putty. 5) Once the circuit is set up, take the first reading from the multimeter. This should be resistance in ohms.

  2. Investigate one or more factors affecting the resistance of metal wires

    Although the 4.5 voltage gave me a high current, it was not high enough that it would cause accidents for the users or damage to the equipment. Therefore, I decided that I would conduct my experiment at both 3.0 Volts and 4.5 Volts to prove that constantan's resistance is not

  1. Factors affecting Resistance of a wire

    It is the same with electrons. If they must travel further round the circuit, they will have to avoid a lot more wire particles. They will obviously collide more, producing less electron flow (otherwise known as current). I predict that at 20cm the resistance will be higher than that of 0.1m, because of reasons previously stated.

  2. Factors Affecting the Current Flowing

    This results in there being more electrons passing through every second and so the current is higher. For a length of 20cm, the first result I got was anomalous and I knew this because when I repeated the result a further two times, I got a reading from the ammeter

  1. To investigate the factors affecting current in a wire.

    Resistance ? Length Temperature When the temperature increases, the resistance increases and so does the length to a certain extent (because when something is heated it expands a little). When there is more heat in a wire, the positive ions collide more.

  2. Investigating the factors affecting the resistance in a piece of wire.

    The variables that I will keep the same will be: * Material of wire-either Copper, Constantan or Nichrome. * Density of wire * Temperature of wire * Shape of wire- straight * Voltage- constant voltage of 2 volts. Circuit diagram for preliminary experiment Method 1 Set up the circuit as

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