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 ± 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.

Some common words found in the essay are:
Results Length, Resistance Length, Diagram Method, Conclusion Length, Current Resistance, Introduction Physical, ´ 10, ´ 10 -7, 10 -7, length m± 001, length m±, m± 001, volts± 005 current, Conductor Aim, voltage volts± 005, current amperes±, 005 current, 001 voltage volts±, voltage volts±, amperes± 005, 001 voltage, volts± 005,
Approximate Word count = 900
Approximate Pages = 4 (250 words per page double spaced)