Unit 3B January 2010
5. A student is doing an experiment to find the resistivity of constantan. His apparatus inclides a length of constantan wire, an ammeter, a voltmeter, a variable resistor and a micrometer.
(b)The student has been told to use a range of current valures to plot a graph of p.d against current.
(ii)Explain how plotting a graph should improve his results?
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