1. The problem statement, all variables and given/known data We conducted experiments using copper wires to observe the effect length has on resistance. We measured lengths from 5 - 30 cm and used a multimeter to measure the voltage while supplying a constant current from a power supply package. The multimeter measures in mV. Plotting the graph of length against power and got a strait line graph which indicated power increased with length, which I thought was great because that's what's supposed to happen according to theory. Our teacher said he expected random results and not the strait line we observed because resistance shouldn't be noticeable in the lengths of wire we used. 2. Relevant equations I'm perplexed, I thought what we had recorded was right. 3. The attempt at a solution No idea what's going on, help understanding this will be very much appreciated.