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

An Investigation into the factors, which affect the electrical resistance of a length of wire.

Extracts from this document...


An Investigation into the factors, which affect the electrical resistance of a length of wire Planning From previous sources I have gathered information on resistance in a wire. I have found that electrons move more easily through some conductors than others. This is due to the resistance in a conductor, which is the opposing force to the current of the electrons in the wire. A good conductor is one, which has low resistance, and therefore the electrons can flow more freely whereas a bad conductor is one, which has high resistance, and the electrons flow with more difficulty. Resistance in created when the electrons going through the wire collide with the ions in the lattice structure of the metal and ricochet, losing speed and releasing some its energy in the process. Resistance is ohms (?) and the best way to find the resistance the equation of: Resistance of a conductor= Voltage across the conductor Current through the conductor Or: R= V I Also from investigation I have found that the four factors, which affect the resistance in a wire, are: * The length of the wire * The cross sectional area of the wire * The material of the wire * The temperature of the wire Prediction I have decided to test the effect of the length and the cross-sectional area of the wire on the electrical resistance as my experiment due the resources and time available. ...read more.


Results This table shows the results I took from the first experiment in which I used wire with an SWG of 22. Length Voltage (V) Current (A) Resistance (?) 30.0 3.13 2.88 1.09 35.0 3.27 2.59 1.26 40.0 3.38 2.37 1.43 45.0 3.46 2.26 1.53 50.0 3.61 2.05 1.76 55.0 3.66 1.94 1.89 60.0 3.71 1.84 2.02 65.0 3.79 1.76 2.15 70.0 3.84 1.64 2.34 75.0 3.95 1.56 2.39 80.0 4.02 1.48 2.72 This table shows the results of my second experiment in which I used wire with the SWG of 34. Length Voltage (V) Current (A) Resistance (?) 30.0 3.94 0.66 5.97 35.0 4.08 0.56 7.29 40.0 3.97 0.44 9.02 45.0 4.23 0.42 10.07 50.0 4.32 0.42 10.28 55.0 4.37 0.39 11.21 60.0 4.39 0.36 12.19 65.0 4.42 0.34 13.00 70.0 4.40 0.31 14.19 75.0 4.43 0.29 15.28 80.0 4.45 0.28 15.89 This table shows the results of my third experiment in which I used wire with the SWG of 36. Length Voltage (V) Current (A) Resistance (?) 30.0 4.84 0.74 6.54 35.0 4.91 0.69 7.12 40.0 5.00 0.62 8.06 45.0 5.08 0.55 9.24 50.0 5.13 0.52 9.87 55.0 5.22 0.45 11.60 60.0 5.29 0.41 12.90 65.0 5.30 0.41 12.93 70.0 5.32 0.38 14.00 75.0 5.40 0.36 15.00 80.0 5.41 0.33 16.39 I calculated the resistance using the following formula: Resistance = Voltage / Current I also got ...read more.


Evaluation I think that the results I got were good and gave me good straight lines on my graph. There were some anomalous results, which were probably due to the wire heating up and therefore changing the resistance of the wire, which is quite possible as I used a relatively high voltage and it was probably the source of the large majority of my errors. Another thing could have been due to the fact that the wire was not absolutely straight and therefore there could have been deviations in the length of the wire. This would have meant that not all my results were completely accurate. I think the apparatus I used and the way I recorded my results worked well as a got a good set of results that I could draw a clear conclusion from. They clearly showed that the length of the wire was directly proportional to the resistance and that the cross sectional area of the wire was inversely proportional to the resistance. My experiment probably would have been more accurate if I had taken several readings for each variation in the experiment to get an average and if I had used previously cooled wire so that it ruled out the possibility of bad results due to the temperature of the wire changing. Also I could have used straightened wire to make sure it was a fair test. ...read more.

The above preview is unformatted text

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. An in Investigation into the Resistance of a Wire.

    Current (A) Resistance V/I (?) 0.095 0.156 0.609 0.119 0.195 0.610 0.133 0.217 0.613 0.148 0.242 0.612 0.169 0.276 0.609 0.203 0.334 0.608 0.332 0.542 0.613 0.348 0.571 0.609 0.385 0.631 0.610 0.417 0.681 0.612 Total 0.611 E26 wire with the length at 30cm Voltage (V)

  2. Discover the factors affecting resistance in a conductor.

    As you can see for my graphs, I was also correct in saying that the smaller diameters will show steeper gradients. Therefore these results support the original prediction, and have allowed me to come to a strong conclusion that I would display to a third party as I am sure

  1. Resistance of a Wire Investigation

    of the wire, where it appeared that it had been melted to some degree at some point. It was therefore decided to conduct experiments on an additional piece of wire that was checked for integrity prior to investigation: Wire 2, Set 1: Length (cm) Voltage (V) Current (A) Resistance (W)

  2. Resistance in a Wire Investigation

    The length will be from 0cm-100cm going up in 20cm intervals. I will also use crocodile clips to connect the wire to the multimeter. When measuring resistance in the length of the wire the independent variable is the length of the wire and the dependant variable is the resistance.

  1. Investigation of the factors that affect the resistance of a wire.

    This is as constant as it is possible to keep the temperature. Furthermore, as well as the factors listed above there are other variables that must be kept constant to ensure fair testing and these can be seen in the list below: o The same apparatus must be used throughout the experiment.

  2. Investigate the factors which affect the resistance of a wire.

    We then set-up the apparatus with wires, a power pack, crocodile clips, an ammeter and a voltmeter. Length of wire (cm) Current (amps) Voltage (volts) Resistance (Ohms) 8.5 0.26 0.08 0.31 19 0.25 0.16 0.64 25 0.25 0.2 0.80 From the table you can see that the resistance of the wire is nearly directionally proportional to the length.

  1. Investigate the factors That Affect the Flow of Electricity Through a Conductor.

    Firstly I decided to use constantan wire as my conductor for this experiment. This is because by using a wire as the conductor, length can be measured easily and the diameter is kept constant. I chose constantan wire in particular because it was available to me and it had has

  2. An investigation into the effect of changing the length of a wire on the ...

    * Crocodile clips * Wires Method: 1. Plug the power pack into the electrical socket and set the voltage to 4. 2. Connect one end of a wire to the + on the power pack and the other end to the - on the ammeter.

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