Rather obviously, because there's a group of you who've chosen to define what an allowable question is far more narrowly than a reasonable person would.
Most people would assume that a question which requires the application of skills in electrical circuit analysis for example would fit better here than on any of the other stack exchange sites.
You've chosen to enact with your votes a defacto policy otherwise - but while you can close or migrate question after question, you can't change how new people think and thus where they initially try to post. That's why you get a "practically limitless population" of people unaware that they are about to become "offenders"
Perhaps it's time to consider that the site might grow its community by being a little bit more open to the diversity of questions which have substantial electrical engineering content.