I’d like to talk about AC ripple and dispel some misconceptions about what is it and what causes it. To do this, I will have to teeter along some of the borderlines of electronic theory, and things may seem a bit abstract at first. Please understand my purpose is not to prepare electrical engineers for their careers but to provide automotive repair technicians with tools of clear understanding for dealing with A/C ripple and its effects on automotive systems. If I sometimes seem to play fast and loose with the rigors of definition, please realize that understanding is my objective; and if I can approach that purpose, I can live, charged with misdemeanors of definition.