An electric circuit consisting of a 1 m long metallic wire XY, an ammeter, a voltmeter, 4 cells of 1.5 V and a plug key was set up. Draw a schematic diagram of this electric circuit on the on positon. Following grpah was plotted between the values of potential difference and current. what conclusins do you draw about the relation between V and I from this graph? state this relations in your words.