Re: [CAD_CAM_EDM_DRO] Re: Capacitors, no CAD, EDM, DRO content but maybe CNC

In a message dated 10/19/2002 1:12:57 PM Central Standard Time,
scotr@... writes:

> But doesn't the voltage rating drop to half when you run caps in series and
> double when you run them in paralell?
>

No, Scott! Probably someone else has answered this more "teacher-like",
later in the board, today, but I hafta throw in MY response now, before I
"loose place": Capacitors in parallel have the SAME "working voltage" as the
lowest of the bunch, but the capacitance ADDS.

Resistors ADD when put in series, and for parallel, the INVERSE of the SUM of
the resistance of PARALLEL resistors equals the SUM of the INVERSE of each
resistor in the bunch. Lessee if I can "type" that here: 1/R(total) =
1/R(1) + 1/R(2) + 1/R(3) + . . . Yeah! That's it!

For caps, ONLY if each was "ideally equal" in the MOLECULARLY-SMALL details,
could you simply ADD the working-voltage of each. In practice, the
"practical" working voltage of caps simply in series would be hardly more
than that of the least in the string. But, if you connect "voltage-sharing
resistors" like I described above for someone else (or was it in response to
a note from YOU???), the WVDC would add.

Jan Rowland, Old Big Ugly


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