1. The problem statement, all variables and given/known data My task is to plan and carry out experiments which show that the resistance of a conductor is proportional to the conductor's length. I have access to the following equipment: http://imgur.com/a/GuqUX Amperemeter, voltmeter, electricity, ruler som other werid things and chromiumnickel 2. Relevant equations I am guessing that I need these equations: U = RI. R = ρ 3. The attempt at a solution Where should I start? First off, do I have the right equations? And secondly, how long should the wires be? 30 cm, 60 cm and 90 cm? Is that good?