Question:
How was the "I" in I=E/R derived? In other words, what
does the "I"
stand for (other than current).

Replies:
The relationship I=E/R is an empirical physical law relating the Quantity
of electrical charge, the difference in electrical potential, and the
electrical resistance. The form of the relation is the same for the simple
flow of a fluid in a straight pipe, where E becomes the pressure drop along
the pipe, R is the flow resistance of the pipe, and the flow in the pipe is
say liters/min and corresponds it the electrical resistance.

To get a feel for how much charge 1 coulomb is, consider that each and every
one an Avagadro's number [6.023x10^23] of electrons carries
1.60217733x10^ -19 coulombs. I'll leave the number crunching.

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