writes:
>Thought so, you'd need some pretty heavy cabling and probably a direct
>connection to the utility company to power a bulb at 100 amps. After all,
>12 volts at 100 amps would dissipate 1,200 watts, and that is into a bulb
>resistance of 12/100 = 0.12 ohms! The loss in the wiring to supply this
>kind of current would be very problematic.>>>
Nah, no problem; you just use some of my Improved Patented
Superconductive Flexible Electron Pipe. In reality, I have seen copper
tubing with oil circulation through used in a couple of rather weird
experimental rigs inside a vacuum chamber for evaporating metal films
onto various substrates. BTW, commercial carbon arc lamps and metal arc
welders can handle upwards of 100 amps at 30-40 volts through 100 or
more feet of rubber jacketed cable regularly. bye, sid.
_______________________________________________
I want to see the enlarger made with an arc welder transformer for a power
supply... Now THAT would be impressive! But I don't want to stand TOO
close... (Again, fumes) Would, I think, lay claim to most unusual enlarger.
Or at least, one of most unusual. Hey, let's invent an enlarger using lime
light... As I recall, that also produced enormous quantities of light. Only,
I forget how lime lights were made. Not sure if they would count as 'Point
Source' or not.
BTW, 12 volts @ 100 watts would only pull about 8.3 amps, a reasonable
household current. I'd use a fan or two from an old computer power supply to
keep it cool. (They run on 12 volts, so powering them would be quite simple)
In fact, using a computer power supply for the whole project would make good
sense... They are plentiful and cheap, well regulated, and many can supply
the current needed. They can be had for only a few dollars or less. Lots
simpler than having to build a power supply from scratch. Just be sure to use
the YELLOW and black wires, the RED and black are 5 volts.
Junkman
