length affecting resistance

• attatch crocodile clip to wire with ocm on ruler
• attatch second croc clip to wire 10 cm away from first and record length
• close the switch and record pd and current using voltmeter and ammeter
• open switch then move croc clip another 10 cm , close switch and record length , pd and current
• repest this for number of length
• use v=ir to get resistance for each length of the wire
• plot a graph for resistance and wire length, should be directly proportional with line of best fit