1. The problem statement, all variables and given/known data Hi, I'm revisiting phasors again. This is one of the topics I've always struggled with. Every time I do a new module, they change a lot of the convention. I've been using Schaums outline of electric circuits recently to get refreshed. I'm just confused on this one part: 2. Relevant equations 3. The attempt at a solution My question is with the w that appears in the forumla for VL. I understand that the current was differentiated to -sin and I understand that L is the inductance from the inductor voltage equation and that I is the amplitude from the current, but where is the w(omega, frequency) coming from at the front?