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Re: Filament voltages
Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>
Tesla list wrote:
> Original poster: "rheidlebaugh by way of Terry Fritz
> Dave: Am I reading correctly, 4 tubes with 10V 10 A filament.
> If so that is 10V 40 Amps or 400 watt. I would not use under
>#10 wire to avoid wire heating.
Concur, more or less. I was addressing the '10A'
only. If 40A, then something heavier may be
in order. Still, for short runs... Or use
4 SETS of #10, one for each tube. Likely good
to go heavier on the WINDING (if it will fit... And if
it WON'T fit, then THAT is a problem).
Mention was made of I**2R losses:
Taking 40A (total) indeed one gets 1600 for I**2.
R for #10 is roughly 1 ohm per THOUSAND feet.
From this the loss in a hypothetical winding and
hookup wiring can be had. Guessing:
10 feet of winding: 0.01 ohms
*40 ==0.4V drop at full load, from winding.
Allow another 10 feet for hook up, another 0.4V.
Losses for this _ASSUMED_ case would be:
1600 * 0.02 =32 W
Drop from no load to full load can be due to:
(And i may be forgetting summat...)