1. The problem statement, all variables and given/known data The voltage across and inductor reaches its maximum value 22ms before the current supplied by the generator reaches its maximum value. What is the lowest possible frequency at which the generator operates? 2. Relevant equations I used the equation V=V_(max)sin(wt+90), where w is the angular speed equal to 2pi(f), where f is the frequency of the generator. I also used the equation I=I_(max)sin(w(t+22ms))=I_(max) 3. The attempt at a solution I recognized that the voltage across an inductor has its maximum value when sin(wt+90)=1, or wt+90=90. This obviously means that wt=0, and i could not get a frequency from that. I then looked at when the current is maximal, or when w(t+22ms)=90, and again i got stuck. I think im missing something simple.