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Determination of r for a Metallic Conductor Aim To determine the resistivity r of a given sample of wire Introduction 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 Apparatus -12V power supply -Power leads -6 connecting leads -2 crocodile clips -given sample of wire 5 m -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 00005mm Diagram Method 1Set up the apparatus as shown on the diagram 2Make sure the voltmeter outlet is at 5 volts and the ammeter outlet is at 1 amp 3Measure 50 cm of the wire using the meter stick 4Connect this part of the wire to the circuit using the crocodile clips 5Make sure the wire is not touching other parts of the wire 6Turn the power supply on record the voltage and current 7Using the variable resistor alter the resistance and take 4 more different readings of
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