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

To investigate the factors which effect the resistance of a wire.

Extracts from this document...

Introduction

Title:   The Resistance in a wire.

Aim:To investigate the factors which effect the resistance of a wire.

Background and Predictions:

There are something important we should know, which can effect the predictions and that is Resistivity. Resistivity is the resistance in each metre of a wire and resistivity is measured in ohms per metre, and the law of resistivity is: -

Resistivity = resistance X cross section area

                                   Length

    = R X A = Ω/m

            L    

As known by Scientifics, resistivity is always constant and for the resistivity to be constant all the time, by the law above one of the factors on the right side of the law must be directly proportional to the resistivty and that is resistance. So if a material has high resistance then it has high resistivity.

Different materials have different resistivities:

Copper = 1.69 X 10

Nichrome (Ni, Cu, Al)= 1.30 X 10

Constantan = 4.8 X 10

And by the way, the less the resistivity the material has, the better conductor it is.

My predictions for the experiments I’m going to do are: -

  1. The longer the wire, the greater the resistance it has.
...read more.

Middle

0.18 Ω

0.175 Ω

15cm

0.18v

0.20v

1A

1A

0.18 Ω

0.20 Ω

0.190 Ω

20cm

0.27v

0.19v

1A

1A

0.27 Ω

0.19 Ω

0.230 Ω

25cm

0.30v

0.26v

1A

1A

0.30 Ω

0.26 Ω

0.280 Ω

30cm

0.35v

0.33v

1A

1A

0.35 Ω

0.33 Ω

0.340 Ω

Copper, 20swg

Length

Voltage /V

Current /I

Resistance /R

Average

Resistance

1st

2nd

1st

2nd

1st

2nd

10cm

0.10v

0.10v

1A

1A

0.10Ω

0.10Ω

0.100 Ω

15cm

0.16v

0.15v

1A

1A

0.16Ω

0.15Ω

0.155 Ω

20cm

0.14v

0.14v

1A

1A

0.14Ω

0.14Ω

0.140 Ω

25cm

0.15v

0.12v

1A

1A

0.15Ω

0.12Ω

0.135 Ω

30cm

0.13v

0.11v

1A

1A

0.13Ω

0.11Ω

0.120 Ω

Nichrome, 15cm

Thickness

Voltage /V

Current /I

Resistance /R

Average

Resistance

1st

2nd

1st

2nd

1st

2nd

32swg

3.40v

4.10v

1A

1A

3.40Ω

4.10Ω

3.750 Ω

26swg

1.40v

1.40v

1A

1A

1.40Ω

1.40Ω

1.400 Ω

20swg

0.40v

0.45v

1A

1A

0.40Ω

0.45Ω

0.425 Ω

Constantan, 15cm

Thickness

Voltage /V

Current /I

Resistance /R

Average

Resistance

1st

2nd

1st

2nd

1st

2nd

32swg

1.3v

1.3v

1A

1A

1.3 Ω

1.3 Ω

1.30 Ω

26swg

0.9v

0.

...read more.

Conclusion

   There were some thing, which effected the results of the experiments, and one of them is the crocodile clips and we noticed that putting the wire on the edge of the clip gives a different result than putting it far inside the clip. Also we had to clip the wire right exactly on the edge to give proper result. Because of doing the experiment all along 6 days and we didn’t use the same exact equipment each day then this may effect the results. Once, we measured the thickness of one of the wires and we found that it has different thickness than it says on the label and that effects the results, of course. One of the important things, which can effect the results of resistance and that, is Heat. When we used a bulb in the circuit, the filament in the bulb gets hotter and when it gats hotter, the atoms of electricity get collision and move faster and this happens can effect the resistance, therefore the results at beginning of the experiment differ the results at the last of the experiment.

   I suggest that to extend the enquiry of the experiment, we shall use much longer wires e.g. 2m, 3m… and by that we can have better sight on resistivity.            

Page  of

...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. Marked by a teacher

    Investigate young's modulus behind Constantan and Copper.

    4 star(s)

    The results show the young's modulus for constantan at the given force. Below is the formulae table showing the formulae which were input into the cells from stress and strain. When simplifying these results it will be evident I belie that the constantan wire will have the higher young's module, and this will be clear in the graphs I produce.

  2. Marked by a teacher

    Draw stress and strain graphs for the metal copper and the alloy constantan. Calculate ...

    4 star(s)

    Results: The results I have been given were given to me on paper format, I have entered these results into the spreadsheet program Microsoft excel and calculated additional calculations to help me plot graphs. The results for copper and constantan are shown on the next two pages.

  1. Marked by a teacher

    Resistance Aim: my main aim is to investigate the factors that affect the resistance ...

    3 star(s)

    As the thinner the wire is the higher its resistance will be, concluding that resistance is inversely proportional to area. * Resistance in series circuit: The results of this experiment proved that in a series circuit the resistors are arranged in a chain, so the current has only one path to take.

  2. An experiment to find the resistivity of nichrome

    This will be done by performing experiments that try and investigate different proposed factors and to see whether they affect the resistance. There are many factors that are known to affect the resistance of an object; it is determined by the nature of the substance of which it is composed,

  1. Discover the factors affecting resistance in a conductor.

    In addition, as the diameter increases, the resistance decreases and vice versa . The graphs are accurate and relate to my prediction and the conclusion obtained. This has led me to a strong conclusion and it entirely supports my prediction.

  2. Resistance and Wires

    This would give me an answer of 29.4cm. This can be proved to be reasonably accurate when plotted on the graph. I have done this as shown on the graph. The reading given by the graph is 31cm, which considering the possibly inaccuracy of the value of 'n', is evident

  1. investigating the factors that effect the resistance on a length of nichrome wire

    and also inversely proportional to the resistance Voltage is the electrical force present causing the charge to move, and it is measured in volts. This gives rise to energy transfer. Electrical energy = Voltage x quantity of charge Energy= Volts x Columbs Calculating thickness of wire: As it is difficult

  2. Investigating The Effect Of Resistance On A Capacitor Circuit

    0.049 0.332 1.088 29 0 0 0.049 0.318 1.067 29.5 0 0 0.042 0.304 1.046 30 0 0 0.042 0.297 1.018 30.5 0 0 0.035 0.283 0.996 31 0 0 0.035 0.269 0.975 31.5 0 0 0.028 0.261 0.961 32 0 0 0.028 0.254 0.933 32.5 0 0 0.028 0.24

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