If we know that in reality electrons flow from negative to positive, then why is the negative terminal of a battery usually still connected as the ground, and things such as switches usually connect in series to the positive side?
In: Physics
We don’t, not necessarily. The terminal we choose as ground is pretty arbitrary, and positive grounded vehicles have existed for a while. We tend not to do it nowadays because negative grounding reduces galvanic corrosion of the frame of vehicles.
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