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

An investigation is being done to find out what affects the amount of resistance there is through a wire.

Extracts from this document...

Introduction

Leanne Haines 11B

Physics – Wires Investigation

        An investigation is being done to find out what affects the amount of resistance there is through a wire.

Variables

Input

Outcome

Length of Wire

Resistance of wire

Thickness of the wire (diameter / area)

Resistance of wire

Type of wire

Resistance of wire

The Temperature

Resistance of wire

To make the test fair, only one variable is going to be changed, the others will be left constant.  The variable that I am going to change is the thickness of the wire.  The type of wire I will be using is constantan.  The length of the wire will be 90cm.  The wire will be this length as the longer the wire, the less time it takes for it to heat up.  If the wire becomes hot the results will change as the electrons in the wire gain more energy.  The investigation will be done at room temperature and in the same room so that the temperature of the wire will be kept constant.

        All atoms are made up of a positively charged nucleus surrounded by small negatively charged particles called electrons.  In the case of metals, some of

...read more.

Middle

9.23

9.03

0.0234

4.73

5.05

4.42

4.73

From these results we can see that the thicker the wire the longer it took for the wire to heat up.  This is because there are more metal ions to heat so therefore it takes longer.  These results have given us a good idea of how long the power supply can be left on before the results will be affected.  The time it takes for the other thickness’ of wire to heat will increase as the wire gets thicker.

Method

The above circuit was set up at room temperature.  A voltmeter was used to measure the potential difference of the wire and an ammeter was used to measure the current.  90 cm of the 1st thickness of constantan was placed into the circuit, the power supply was turned on and the current and potential differences were measured.  The experiment was done 3 times and an average resistance was found.  The power supply was only on for a few seconds, (the time it took to get a result).  It was then quickly turned off to prevent the wire from heating up and the results from being affected.  It was also done for our safety.

...read more.

Conclusion

Evaluation

        As you can see from the results table there where no obvious anomalous points.  The voltage was varied to show that V/I was constant if the temperature didn’t change.  The length of the wire was kept the same for each test.  The experiment was repeated three times to get a more accurate average and each time the test was repeated the same piece of wire was used.  The same type of wire was used throughout the investigation.  The variation also helped produce a more accurate average.  The evidence obtained is good enough to support a firm conclusion. A micrometer screw gauge was used to measure the thickness of the wire.  

I think the experiments done were quite accurate, although I think more could have been done to prevent the wire from heating up.  We could have timed how long the power supply had been left on more accurately so that, by using our preliminary work, we could have been able to predict more accurately when the wire was getting hot, and therefore when the results could have been effected.

...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. Resistance of a Wire Investigation

    These results could be done better. If I were to do this experiment again, I would use newer, more accurate ammeters and voltmeters, a more accurate method of measurement, and take a much wider range of readings, and more readings so that a more accurate average can be taken.

  2. An in Investigation into the Resistance of a Wire.

    to the current and I could have included a switch in my circuit so that I can break the circuit quickly if I needed to. I made sure that my bag was underneath the table as well so they are not in the way of other people.

  1. Testing the strength of electromagnets

    I could have also done another test from 20-35 coils because I got odd readings/anomalies on those ones in test one so couldn't average them up which could have given me a more fair average result. The experiment may not have also been a completely fair test, as the iron

  2. To find out what happens to the efficiency of a motor as I change ...

    2. The way in which the string wrapped around the spindle: The string could be seen winding round the motor's spindle in different ways. This would have affected the amount of friction between string and spindle, which could have both lowered the efficiency or increased it.

  1. An investigation into what affects the resistance of wire

    So they will be repelled from negative side and will be pulled to the positive side. I will be connecting my components in series except the voltmeter which I will have to connect in parallel to 100cm long 24 standard wire gauze.

  2. Find out how the thickness of a wire affects the resistance.

    But then the will be deflected by the non f lowing electrons that are 'orbiting' the atoms that are not moving, and therefore the flowing electrons will slow down. This will cause the non f lowing electrons to speed up, but they do not move in the direction of the electric current.

  1. What affects the resistance of a wire?

    Therefore there are more atoms getting in the way of the current, which means there is a higher resistance to the flow of current. So as the wire gets shorter, the numbers of atoms available to resist the flowing electons decrease.

  2. To find out what variable affects the resistance of a wire.

    (Sources = Physical Processes, Nick England & Class notes & the internet - Yahoo - resistance & Britannica encyclopaedia) OUTPUT VARIABLE: The resistance of the wire. INPUT VARIABLES: *Length of the wire* - affects the resistance because there are more electrons moving and the longer the wire, the more atoms they will hit.

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