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    Temperature dependence of resistance

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    (a) A 5 m length of copper wire at 20°C has a radius of 0.25mm. If a potential difference of 10V is applied across the length of the wire, determine the current in the wire.

    (b) If the wire is heated to 50.0°C and the 10 V potential difference is maintained, what is the resulting current in the wire?

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    Solution Preview

    a) We can use Ohm's law to determine the current for V = 10 V.

    For copper resistivity, r = 1.7à?10^-8 Ohm m,

    The resistance is,

    R = rl/A ...

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