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

Factors affecting the resistance of a wire.

Extracts from this document...


Factors affecting the resistance of a wire Prediction I will investigate how different lengths of wire will affect the resistance. I believe that the longer the wire, the higher the resistance. This is because the longer the wire, the more nuclei stand in the way of electrons, restricting the space in which they have to move through. This causes the wire to heat and the current to go down. Electrons are not lost, but they take longer to get through the wire. I have sketched a graph to show my prediction. As you can see, as the length increases so does the resistance. Ohm's law shows that my theory is correct: Voltage (v) = current (A) x resistance ( ) Also shown in the diagram: "If you increase the resistance by making the wire gradually longe, then less current will flow if the voltage remains constant. If you increase the voltage then more current will flow." ...read more.


I then measured an 100cm long piece of nychrome wire and placed it between 2 crocodile clips 3) I turn the voltmeter and ammeter on and finally the power pack. 4) I took the readings and recorded them (see next page) 5) I rearranged the crocodile clips to form lengths of wire 90cm, 80cm etc long and repeated the experiment for each length making sure the wire was accurately measured. Results Length (cm) Volts Amps Resistance 100 4.78 0.3 16.0 90 4.77 0.33 14.5 80 4.69 0.36 13.0 70 4.60 0.40 11.5 60 4.50 0.47 9.6 50 4.39 0.54 8.2 40 4.20 0.66 6.4 30 4.00 0.80 5.0 20 3.70 1.05 3.5 10 2.80 1.74 1.7 Length (cm) Volts Amps Resistance 100 4.74 0.28 16.9 90 4.67 0.33 14.2 80 4.62 0.37 12.5 70 4.53 0.41 11.0 60 4.44 0.47 9.5 50 4.33 0.54 8.0 40 4.17 0.66 6.3 30 3.91 0.85 4.6 20 3.56 1.14 3.2 10 2.68 1.90 1.4 Length (cm) ...read more.


were as short as possible to make sure there was no major resistance through them. This would provide me with more accurate results and a more reliable experiment. I would also record my results in two or three decimal places to make sure that if, when rounded up and two or more numbers were the same, I would keep more decimal places and would therefore have a more accurate resistivity result. I could also increase the number of different lengths, which would then create more results giving me a more accurate graph and line of best fit. I would also allow myself more time so I can do the experiment more times and therefore have more results, so I could end up with a more accurate line of best fit. The crocodile clips I would use would be sturdier as they clipped onto the wires very loosely, making them dangerous and prone to falling off. Although using the same length of wire ensures a fair test, it could be damaged from previous circuits and lengths. ...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. Discover the factors affecting resistance in a conductor.

    I considered using many different conductors to allow me to see a range of results. But , from my scientific knowledge, I found that not all conductors at in the same way.

  2. Factors Affecting the Efficiency of a Wind Turbine

    This was only true up to the length of 7cm. From 9cm the a/c output falls dramatically falls dramatically. On 11cm it falls further but not as much as it does from 7 to 9cm. Under these circumstances I decided to create blades that had a length of 8cm.

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

    Therefore I think there were faults in the method that led to these inaccurate results. Anomalous Results - There were points that were just off the best-fit line. However, I still believe there are many anomalies. This is especially evident for isotope B.

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

    In alloys, there are different sized ions and so the electron pathways are irregular and so it is more difficult for the current to get through therefore creating a higher resistance. During this experiment, I have already decided that I will use constantan since it has a high resistance and

  1. Investigation into the factors affecting the resistance of wire

    500 0.1 0.1 0.1 0.33 0.32 0.33 0.306186869 0.2 0.031415927 1.92383E-05 Copper 36swg 550 0.1 0.1 0.09 0.29 0.3 0.3 0.32605364 0.2 0.031415927 1.86241E-05 Copper 36swg 600 0.1 0.1 0.1 0.25 0.26 0.27 0.384995252 0.2 0.031415927 2.01583E-05 Copper 36swg 650 0.1 0.1 0.1 0.24 0.25 0.25 0.405555556 0.2 0.031415927 1.96014E-05

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

    shown above with the power pack set at a constant voltage of 2 volts. 2 I will use 2 different lengths of wire in my preliminary, the largest 100cm and the smallest 10cm so I can find the material with the largest resistance range.

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