1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution Just want to know whether I have the right idea: so to determine the reverse saturation current (IS), I just determine it for each value of VD that was given? So finding IS for 0.6, 0.65, 0.7 etc? The question seems to be divided into two parts, one that just asks for the reverse saturation current, and then to sketch a graph for points VD=0.6, 0.65 etc. But it's not as if we're already given an initial VD value to determine the reverse saturation current, so I'm guessing you just find it for the various values given? Thanks.