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Investigate the factors which affect the resistance of a wire.

Extracts from this document...

Introduction

Physics Coursework

Aim

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

Ideas

I think that the resistance of a wire will depend on the following factors:

  1. Thickness of the Wire (Cross-Section Area)
  1. Length of the wire
  1. Material that the wire is made of.

I am going to investigate factor two: the length of a wire.

Prediction

I am investigating whether the length of a wire will affect the resistance of a wire. I predict that as the length of the wire increases, the resistance of the wire will also increase. I also predict that as I increase the length of the wire then the current will decrease.

(1) I predict that as the length doubles, the resistance will double and the current will decrease by half.

(2) I predict that as the length triples, the resistance will also triple and the current will also decrease into a third.

E.g. The resistance is directly proportional to the length of wire and the current is inversely proportional to the length or resistance.  

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Middle

Actual Work

Diagram

Equipment

Equipment Needed:

            ●Voltmeter

            ●Ammeter

Wires

            ●Crocodile Clips

            ●Meter Ruler

Method

      ●I collected all the equipment I needed and set it up as in the diagram. (See Preliminary Work)

      ●Then I measured 10cm on the ruler and took a recording for Voltage and Current. I worked out resistance using voltage and  

       current that i had jus recorded. (Voltage/Current = Resistance)

      ●I then repeated this for measurements 20cm, 30cm, 40

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Conclusion

Evaluation

I think that my results are accurate and reliable because they have enabled me to draw a line of best-fit graph. The graph shows a pattern between 10cm and 100cm and I was able to make a simple conclusion.

My results are quite reliable because I made 3 measurements of current and voltage for each length and used the average values to calculate Resistance. Even with that I still had two anomalous results at lengths 70cm and 80cm.

The experiment I did was successful but I did have some difficulties doing it. If I could redo the experiment I would:

  1. Make sure that the wire is always taut. If the wire isn’t taut the lengths I measure could be inaccurate and my results wouldn’t be reliable.
  1. I would make sure that when I used crocodile clips they didn’t scrape the wire because this may affect the thickness of the wire and it would make my results unreliable.
  1. Make sure that the batteries I use are not old or different as they may have different voltages from each other. This would again make my results unreliable and inaccurate.

...read more.

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

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