Draw a graph wire through which current passing it 'i' and potential diffrence 'v'?
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if the current is passed through an ohmic conductor the graph will be linear
if the current is passed through non-ohmic conductor the graph will be non-linear
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If you plot a graph of current against potential difference for a wire, you get a straight line.
Graph of potential difference (V) against current (A), showing a straight line running from origin to top right (positive)
The gradient of the line is equal to the resistance of the wire
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