The number of electrons flowing per second is the inverse of the electron charge.

Using the fact that the current , where is the electron charge, this yields:

So, in the quantum case we should start filling capacitance with the one electron charge:

Imagine n 10 point-charges, each having 1/n of an electron charge.

There is some controversy over selectivity in Millikan's use of results from his second experiment measuring the electron charge.

The shaped electron explosive charge sliced clean through the courtroom door with a lightning-bolt flash.

Millikan's value for the electron charge was too small.

This is related to, but not the same as, the measured electron charge 'e'.

Same result if the electron charge didn't exactly balance the proton charge.

The value of the electron charge would become a defined number, not measured, making μ a measured quantity.