Re: capacitors in series - pitfalls?
The official abbreviations for SI prefixes that are multiples of the basic unit are capital letters, except kilo which is small k. (Prefixes for submultiples are always small letters, including ยต, the only Greek one).
Capital K is used as abbreviation for Kelvin - so arguably there could be scope for confusion, though it's unlikely in practice.
I also use the product over sum formula for two capacitors in series - and yes a quick sanity check is that the result should be less than either. And, other things being equal, if the capacitors have different values the voltage divides between the capacitors in inverse proportion to their values, until leakage resistances redistribute this...
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