"cnctut" wrote in message
oups.com...
I've never seen wattage ratings on a capacitor--voltage yes. Is it
simply .5CV^2 and that's it? I can design a circuit for a particular
capacitance--but how is the physical size of the Cap determined--I've
seen big capacitors with same MF's as little caps? What am I missing?

The size is determined by the capacitance, the voltage, the ripple current
rating and the technology used.

N