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    • Thread Starter

    Not sure about second part of this question:

    Current I through a wire of resistivity p varies with length L, area of cross-section A and pd V in accordance with the equation I = VA/pL.

    Sketch a graph of I against a) V , b) L , c) 1/L

    Explain how you would determine the resistivity from the graph of I against a) V b) 1/L

    So the graph of I against V is a straight line graph where the gradient = A/pL.
    Can resistivity be found by calculating the gradient and rearranging to get p = AL/gradient?

    And the graph of I against 1/L is a straight line graph with gradient = VA/p and you could rearrange this to get p = VA/gradient but V isn't a constant so how would it work?
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