Mike Baker <k7dd@earthlink.net> wrote:
> Whilst reading all the thoughts about DC filaments, something
>crossed my mind. If we use say 6.3VAC as normal filament voltage and
>switch to DC, wouldn't the DC equivalent for heating purposes be .707
>times 6.3v = 4.5955VDC??? or have I missed something?
Yeah. What you missed is that "6.3VAC" is 6.3 root-mean-square (RMS)
volts, which dissipates the same power in a resistive load as 6.3 V DC.
What you're probably thinking of is the fact that the RMS of a sine wave is
0.707 times the amplitude, or peak value, of the wave.
-Chuck W1HIS
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|