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    Hi,

    Values
    Wire 2 - Length 200mm - Diameter 0.45mm
    1.4468 Ω at 2v
    1.4518 Ω at 4v
    1.8820 Ω at 6v

    Wire 3 - Length 200mm - Diameter 0.45mm
    2.7873 Ω at 2v
    2.7897 Ω at 4v
    2.7864 Ω at 6v

    q5.
    Find how the resistance varies with the length of the wire.

    Whats the best way to do this? Graphically?

    Thanks
    Matt
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    Do you know the relationship between resistivity and resistance?

     \rho = \frac{R\,A}{L}

    where:
    A - cross sectional area of wire
    L - Length of wire
    R - Resistance
    rho - Resistivity

    So you can work out A using  \frac{\pi D}{4}
    where D is the diameter of the wire, you know the length of your wire.
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    the equation:

    resistance = resistivity (length/ cross sec area)
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    I understand what the resisitivity equation is, however i need to find out how the resistance varies with length? Surely i should draw some sort of graph?
 
 
 
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