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

To investigate how the length and area of wire affects its resistance.

Extracts from this document...

Introduction

To investigate how the length and area of wire affects its resistance. Abstract: Aim: To investigate how the length and the area of a wire affects its resistance. Apparatus: 1 200cm ruler, 10 leads, 1 battery pack, 5 pieces of constantan wire 210cm long, 1 amp metre, 1 Volt metre, tape, scissors. Method: First we stretched the wire tight and taped it to the 200cm ruler with equal amounts of wire hanging over each end of the ruler then attach the crocodile clips at points 0cm and 200cm on the ruler, then we put our ammeter in our circuit and our voltmeter then we took each set of results three times to take an overall average so that we can try and eliminate experimental errors. Variables: The length of the wire, the area of the wire how much voltage is passed through the wire, Types of wire? Prediction: For length of wire, I predict that the longer the wire the bigger the resistance. ...read more.

Middle

6.) Switch of power pack and move crocodile clips down 20cm, so the length of the wire is 180cm. 7.) Control current to 0.4A and take voltage. 8.) Control current again to 0.5A and take voltage. 9.) Repeat with the following lengths; 160cm, 140cm, 120cm, 100cm, 80cm, and 60cm. 10.) Repeat all of this using same apparatus with wires of different thicknesses. 11.) Work out thickness using micrometer and formula pie*radius�. 12.) Calculate resistance-using formula. R(?)=V/I Constantan wire, diameter 0.234mm, area = pie*r� = 0.043mm� Length/cm Current at 0.4A Current at 0.3A Average resistance/? Voltage/V Resistance/? Voltage/V Resistance/? 200 9.80 24.50 7.30 24.30 24.40 180 8.75 21.88 6.56 21.87 21.88 160 7.82 19.55 5.90 19.60 19.58 140 6.79 16.98 5.09 16.97 16.58 120 5.80 14.50 4.42 14.73 14.62 100 4.86 12.15 3.63 12.10 12.30 80 3.93 9.83 2.94 9.80 9.82 60 2.96 7.40 2.21 7.37 7.39 Length/cm Current at 0.4A Current at 0.5A Average resistance/? ...read more.

Conclusion

Voltage/V Resistance/? Voltage/V Resistance/? 200 3.60 9.00 4.49 8.98 8.99 180 3.22 8.05 4.08 8.16 8.12 160 2.86 7.16 3.58 7.16 7.16 140 2.51 6.28 3.16 6.32 6.30 120 2.15 5.38 2.71 5.42 5.40 100 1.80 4.50 2.27 4.54 4.52 80 1.45 3.63 1.79 3.58 3.60 60 1.11 2.78 1.36 2.72 2.75 Constantan wire, diameter 0.457mm, area= pie*r�= 0.16mm� Length/cm Current at 0.4A Current at 0.5A Average resistance/? Voltage/V Resistance/? Voltage/V Resistance/? 200 3.60 9.00 4.49 8.98 8.99 180 3.22 8.05 4.08 8.16 8.12 160 2.86 7.16 3.58 7.16 7.16 140 2.51 6.28 3.16 6.32 6.30 120 2.15 5.38 2.71 5.42 5.40 100 1.80 4.50 2.27 4.54 4.52 80 1.45 3.63 1.79 3.58 3.60 60 1.11 2.78 1.36 2.72 2.75 Length/cm Current at 0.4A Current at 0.5A Average resistance/? Voltage/V Resistance/? Voltage/V Resistance/? 200 2.50 6.25 3.09 6.18 6.22 180 2.26 5.65 2.79 5.58 5.62 160 1.99 4.98 2.47 4.94 4.96 140 1.75 4.38 2.17 4.34 4.36 120 1.47 3.68 1.86 3.72 3.70 100 1.24 3.10 1.54 3.08 3.09 80 1.00 2.50 1.25 2.50 2.50 60 0.76 1.90 0.94 1.88 1.89 ...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. Investigate how mass affects the diameter of an impact crater.

    Therefore, in order to conduct an accurate experiment, the height will need to be kept constant. In addition, from these findings I have decided I will use a height higher than the ones experimented. This will allow me to notify the trend of varying mass in detail.

  2. To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

    This is the variable that I have decided to change in this experiment. It is one of the independent variables in this experiment. The resistance should increase as the length of the wire increases because as the length of the wire increases, so does the amount of atoms in the wire.

  1. To investigate how length affects the resistance of a length of wire

    This same can be said for electrons in a wire, the larger the diameter/cross section, the more electrons are able to travel trough the wire at the same time. All these factors must be kept constant to make the investigation fair. The same apparatus must be used throughout the investigation.

  2. To investigate whether the surface area or the lengths of the carbon putty will ...

    firstly to measure the current and then have to calculate the resistance, as we were also provided with ohm meter, I decided to measure the resistance directly. From the preliminary experiment above, I came up with the method below. Apparatus: Carbon putty 2 x 5p coins 2 x crocodile clips

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