To a reasonable approximation, the rms ripple current through a filter capacitor at 100/120 Hz is the rms ripple voltage divided by the reactance at 100 or 120 Hz.

The ESR of the capacitor is important to determine its maximum ripple current specification, but has little effect on the current (so long as ESR <<

*X*_{C}, the reactance). At 100 Hz, the reactance of 11 mF is 0.14 ohms, while a good aluminum capacitor of that value has an ESR of about 0.03 ohms.

Interestingly, at no DC load current, the ripple across the capacitor is very small (theoretically zero), but the ripple voltage increases as you increase the DC load current, roughly proportional to the current.

Since the voltage across each capacitor is equal (parallel connection), the ripple currents will be equal (to within the capacitance tolerance).

For a detailed calculation of traditional power supply rectifiers and filters, I refer you to "PSUD2", free software written by Duncan,

https://www.softpedia.com/get/Science-CAD/PSU-Designer-II.shtml(Note that the transformers are specified by no-load voltage and effective secondary resistance, which can be calculated from the catalog output voltage at specified current, and a specified or estimated efficiency.)