GCSE Physics Coursework - Resistance of a Wire Coursework Resistance of a Wire
Date Submitted: 03/03/2004 05:01:05
Category: / Science & Technology / Physics
Length: 6 pages (1612 words)
Category: / Science & Technology / Physics
Length: 6 pages (1612 words)
GCSE Physics Coursework - Resistance of a Wire Coursework
Resistance of a Wire
Task
To investigate how the resistance of a wire is affected by the length of the wire.
Theory
What is resistance?
Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i.e. it has less resistance. For example, gold …
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… not allowed to cool completely so that the temperature was higher for that measurement. Whilst unlikely (due to the two sets of results), this would cause a higher resistance as explained previously. However, it is now known, after researching the metal alloy "constantan," that the resistivity (the electrical resistance of a conductor of particular area and length) of this alloy is not affected by temperature. Therefore, in these experiments Ohm's Law does not apply.
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