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To find out the difference of resistance through a length of constantan wire.

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Introduction

                                                                                         Physics Coursework

Investigating Resistance Through A Length Of Constantan Wire

Aim:

To find out the difference of resistance through a length of constantan wire.

Research:

During my research and preliminary experiments I have discovered the following:

‘The electricity will be conducted via free electrons, resistance is created when free electrons collide with atoms in the wire, therefore the longer the wire the more atoms – which means more atoms to collide with free electrons – which means more resistance.’

Temperature will affect the resistance of a wire. When the temperature is increased the atoms within the wire will begin to vibrate more, meaning that there will be more collisions between the free electrons from the flow of the current and the atoms.’

Through my research of Ohm’s Law I have found how to calculate resistance, current and voltage

image00.png

V=IxR

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Middle

Goggles must be worn at all times.Tuck ties into shirtsMake sure bags are not in the walkways.Put all stools/chairs under tables.Check that no liquid is near the experiment at any time.

Graph:

image01.png

Original Results Table:

Resistance

Test 1

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Conclusion

  1. For example we could have used the cross section as a variable instead of/along with length.
  2. We also could have used different metals with different chemical makeup, for example NiChrome wire made up of Ni, Co, Fe which would have different conduction properties to the wire we used and therefore would create a different set of results.
  3. Knowing that heat affects the atoms in the wire which in turn affects the flow of current (free electrons), we could have increased or decreased the temperature which would deviate* our results.

In conclusion we found that many things affect the resistance in a length of wire mainly cross section diameter, wire length and wire temperature. If I was to do this experiment again I would definitely investigate further to give a broader range of results.

Physics GCSE Coursework 2005.

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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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