Alec Cameron said the following to MIKE ROSS on the subject of
Power Factor in DC cct (18 Jan 98  14:17:34)
 AC> On (15 Jan 98) MIKE ROSS wrote to Tim Hutzler...
 MR> there exists no such thing as an
 MR> apparent power in a DC circuit.
 AC> To uphold my "talent" for nit- picking, I draw your attention to the
 AC> brief switch-on, and switch- off intervals in a DC circuit.
Indubitably I must agree that your eloquence is only surpassed by your
inimitable talent. However, to argue voltage rise times is to deal with
durations which are but a fraction of a resonant cycle. Thus in the
light of your enthused nitpicking safari, it is not strictly AC.
Conversely if the voltage is changing then it is not really DC either.
Circuit transient effects is a different behaviour and is unconnected
with the conventional AC theory definition for power factor. The reason
being that this neglects hysterisis, dielectric, and radiative losses.
Power factor is measured with a VAR meter, not with a storage scope.
Transient effects is better dealt with using pulse techniques not PF.
... Ice Storm of '98 refugee.
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