1. The problem statement, all variables and given/known data Ok, so I did this.. V=IR I=(1/R)V, gradient is (1/R) -> y=mx+c So in order to have the smallest resistance, we choose the point on the graph that has the largest gradient, which I chose B, because the tangent on the graph on point B is the largest, but the correct answer is C. Why? 2. Relevant equations V=IR 3. The attempt at a solution The mark scheme states that we have to draw a line through the origin up to the point on the graph, and the line that has the largest gradient is the right answer, which is point C. But why through the origin? I thought tangent? As we are looking for the gradient?