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    Resistivity of a metal wire

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    The resistance R = V/I of a wire of radius 0.5 +/-0.005 mm length 2.00 +/- 0.001 m is measured using the circuit shown in Fig 1.3. The quoted accuracy for the digital meter used are +/-0.01% x scale reading. The measurement made during the experiment are as follows (see attached file for data).

    Do you have to worry about the accuracy of a voltmeter or ammeter?
    What is the value of the resitivity p(omega-m) calculated from the expression R=pL/A?

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    Solution Summary

    We estimate the resistivity of the metal in a wire, given data on the applied voltage and current through the wire as well as its length and radius.