Hello, I was being taught AC in High School, It was good but the way they taught us DC, things like drift velocity, no of electrons per unit volume etc, it was easy to visualize electrons rushing in a conductor. I tried to visualise AC(which was not taught to us) and I came to a conclusion that as in case of SHM or more specifically spring mass system the force direction periodically changes, the EMF in the conductor carrying AC also changes periodically hence the force on every electron is also changing direction periodically. So the electrons are having SHM in the conductor similar to the particles oscillating in organ pipes' first harmonics. Am I correct? IF not please describe me what is microscopically going in AC.