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To investigate how the electrical resistance of a wire changes in relationship to its length.

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Introduction

Physics coursework

Aim:To investigate how the electrical resistance of a wire changes in relationship to its length.

Prediction: I think that as the length of the wire increases so to will the resistance of it.  I also believe that the rate of the resistance will be in proportion to the length of the wire, for example if the

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Middle

Physics coursework

Method:

  1. Set up apparatus as diagram shows on previous page.
  2. I connected a wire with the thickness of 0.56 mm and a length of 600mm (to start with) to the crocodile clips to the ends of the wire.
  3. I put the wire in the water.
  4. I then switched the voltage around from 0 to 15 on the lab pack to give me a measurement in amps which gave me my current.
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Conclusion

Ohms law.

Formula for resistance is; R=V

                             I

Ohms Law is a mathematical equation that shows the relationship between Voltage, Current and Resistance in an electrical circuit.  Ohms are equal to the potential difference, in volts divided by the current, in amperes.As the length of the wire is increased the number of collisions the current carrying charged particles make, with fixed particles also increases and so the value for the resistance of the wire becomes higher.

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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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