Seems like you’d want to be careful with the source of the electrons so the negative terminal would be covered/protected and the positive would be wired to the frame. But it is the opposite. I presume there is a good reason that I do not understand.
In: Engineering
It really doesn’t matter whether you use positive or negative ground. Some vehicles have had positive ground. The convention of saying that current flows from positive to negative was established by Ben Franklin before we knew about electrons. Conventional current flow is opposite electron flow. Current flows in a loop from source to load and back to source.
Interestingly, electron flow is very slow compared to the speed of electricity. It is usually less than 1mm/second while electricity flows at 50% to 90% of the speed of light. Electricity travels as an electromagnetic field. I like to think of it as one charge pushing the others along like a drinking straw full of peas. Add a pea to the end and one will immediately pop out the other end.
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