From the graph, slope of wire \\\\(A\\\\) is greater slope \\\\(=\\dfrac { dy }{ dx } =VIR=VI=\\\\) slopeHence wire \\\\(A\\\\) has greater resistance. The heat produced by resistor is given by \\\\(P={ I }^{ 2 }.RT\\\\). It is directly proportional to square of current paring through it resistance and time for which the current passes through the conductor. Hence \\\\(A\\\\) wire is made of a material of high resistivity.