I can only speak for myself here but… A lot of things are taught in school. Most of them weren’t something that I use everyday and thus have forgotten about it (some more than others, of course).

Ohm’s Law would’ve been taught to me sometime during highschool (as the other commenter mentioned, I can tell you it relates to electricity but without looking it up I couldn’t tell you the actual principle behind it) - I graduated from highschool 10 years ago, and have not had a reason to “flex” that memory ever since then.