metallic conductor

A detailed Summary of metallic conductor


Determination of r for a Metallic Conductor

To determine the resistivity (r) of a given sample of wire

Physical factors that affect the resistance of a conductor are length, cross sectional area and a constant that depends upon the material called the resistivity. The resistance per unit length is the same all along a uniform wire so if the resistance of different lengths of a wire is found out, the resistivity can be calculated.

Resistance of a material, R = Voltage / Current

Resistance of a conductor, R = r × Length / Cross sectional area

- variable resistor - is used to alter the resistance to change the current and voltage for each length

- ammeter - the 5 ampere outlet was used since the current was generally over 1 amperes

- voltmeter - the 5 volt outlet was used because voltage was always below 5 volts

- meter stick - more appropriate than a 30 cm ruler because the length is changed by 50 cm each time

- micrometer - since the wire is very thin an accurate measurement of the diameter can be obtained by using a micrometer with an uncertainty of ą 0.0005mm.


7. Using the variable resistor, alter the resistance and take 4 more different readings of voltage and current for this length.

10. Measure the diameter of the wire using the micrometer. Take 3 reading at different places on the wire to reduce the uncertainty.



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Results Length, Resistance Length, Diagram Method, Conclusion Length, Current Resistance, Introduction Physical, ´ 10, ´ 10 -7, 10 -7, length mą 001, length mą, mą 001, voltsą 005 current, Conductor Aim, voltage voltsą 005, current amperesą, 005 current, 001 voltage voltsą, voltage voltsą, amperesą 005, 001 voltage, voltsą 005,

Approximate Word count = 900
Approximate Pages = 4 (250 words per page double spaced)

Category: Science

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