In a world where magic exists, a specific character can channel electricity in whatever way you might imagine. They are relatively immune to suffering physical injury even for high voltage or current. Their body is somehow a close-to-ideal conductor. Let's not worry about how that makes sense and just leave it as a prerequisite.
This character would have an intuitive understanding of current and voltage without ever having encountering the formal terms, I would imagine. They'd say a higher voltage "feels like x" and a higher current "feels like y."
The question is, how might they describe the sensational difference between these two measures? I haven't been able to pin down a fluid way an uneducated (not stupid, just literally lacking formal education) person who only has an intuitive understanding might put this into words.
EDIT: I am refraining from the obvious experiment of electrocuting myself. Believe me, I'd like to, however I have just enough sense to avoid that.