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Investigate how the resistance of the wire changes as the length of the wire changes.

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Introduction

Physics Coursework

Aim: To investigate how the resistance of the wire changes as the length of the wire changes

Background information: Some information that I must take into account is: That the resistance of a wire is

  1. Directly proportional to its length
  2.  Inversely proportional to its cross section area

I can use Ohms law in my experiment to calculate the resistance.

Ohms Law = V =IR

                       Voltage = Current Resistance

This can be rearranged to give me the resistance to

R = VI

Resistance = Voltage Current

Prediction: I predict that if the length increases then the resistance will also increase in proportion to the length. I
think this because the longer the wire the more atoms and so the more likely the electrons are going to
collide with the atoms. So if the length is doubled the resistance should also double. This is because if
the length is doubled the number of atoms will also double resulting in twice the number of
collisions slowing the electrons down and increasing the resistance.

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Middle

Risk assessment: There are a few different factors, which could make this experiment unsafe they are.

  1. I must be careful with the power supply
  2. I must turn the power supply of after each go otherwise the length of wire will heat up. This will firstly ruin the results and secondly I could get a burn
...read more.

Conclusion

Evaluation: Overall I feel this has been a successful investigation and I have learnt a lot. My prediction was supported by the evidence, which I withdrew from the experiment. I had said as the length of the wire increases so will the resistance. I feel the experiment was accurate but could of bees improved by measuring the pieces of wire more accurately. I kept all the variables the same, kept the power pack on 2volts and repeating each test 3 times all these contributed to making it a fair test. It was hard to control the temperature.

      If I could do the experiment again then I would do some things differently. I would of looked into and done some preliminary experiments about other variables. I would of used a higher voltage on the power packs and recoded my results clearer. I would use the same equipment. If I had more time I could of looked into more variables such as the area of the wire or different temperatures.                                

...read more.

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