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Measuring The Resistivity Of A Pencil Lead.
The first 200 words of this essay...
PHYSICS COURSEWORK 16TH JANUARY 2003
Measuring The Resistivity Of A Pencil Lead
The resistance of two objects is not always the same due to "resistivity". The resistance of a uniform conductor depends on :
* Its length (L)
* Its cross-sectional area (A)
* The material of which it is made
Therefore, the relationship between these three variables and resistance is as follows:
Where : - R = Resistance
P = Resistivity
L = Length
A = Cross-sectional Area
Resistivity is defined as a materials opposition to the flow of electric current of a cubic metre of a material.
To measure the resistivity of pencil lead I will need the following apparatus.......
* 1 x Power Pack (Ranging from 2V - 12V)
* 1 x Voltmeter (Reading up to 20V, giving readings to 0.00 with a ?3% error reading)
* 1 x Ammeter (Reading 20m/10A, giving readings to 0.00 with a ?0.5% error reading)
* 1 x Rheostat
* 1 x Micrometer (with an error reading of ? 0.005mm)
* 1 x Metre rule (with mm
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""Yvette Agars. Senior History Teacher. Saint John's College. Whyalla S.A.
""George Boustred English, Maths, Science, Resistant Materials, History, Music. GCSE Student