Who first assigned "negative" to electrons and "positive" to protons? a sorta history question... the fact that the actual flow of charge (which are electrons in metal conductors) is in the opposite direction of the "positive" current flow in circuits has always been an annoyance to me. the fact that it's electrons that are moving in a conductor is a matter of physical reality, not convention. the fact that electrons and protons both have the same magnitude of charge, but opposite polarities, is a matter of physics, not convention. but the fact that electrons were assigned "negative" which necessarily make protons "positive" must be a matter of convention. where and with who did that convention begin?