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Conventional current? Back then they thought that electrons flowed from the positive terminal to the negative terminal.
The original model of electricity didn't involve electrons. It didn't consider charge to be quantised at all but had to choose a 'sign' and happened to make an unfortunate (for students) choice.
I am talking about electrostatic positive and negative charges. Why are field lines drawn away from a positive charge.
Isn't this just because we live in a matter universe and not an antimatter one? That is, we deal with a flow of electrons, and not positrons?