Can anybody explain about 41Dy11 Vector Group of a transformer and
what it really make difference from other conventionally used vector
groups

If any one knows about 41DYN11 Transformer vector group please Explain
about the same and the purpose of the same PLEASE.

My father is afraid of his treadmill suddenly stopping while he's
walking due to a power outage. I figured that a ups backup could give
him some time to step off before it stopped. But I figured that the
least expensive one with the lowest power rating would work, since I
assumed that the power rating was only to give you an estimate of how
long the unit will power an item.

Since most of the ups units offer several minutes for a low load, I
figured that it would give a more than adequate 10 to 20 seconds at
the higher load of a treadmill.

Will it work or will something trip inside the unit if the load is
greater than the rating?

Thanks,
Jeff

Just to point out a fact that I have designed several 1:1 ratio
autotransformers in the past. So yes they are out there.

Their principle use is as a phase shift transformer, generally at
mains voltage they help to give 12 pulse rectification if one bridge
is connected direct to the mains.

Euclid

On Mon, 17 Dec 2007 07:35:13 -0500, "evo" sc.rr.com> wrote:

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Perhaps the funny case is the EZ-Bake oven, a toy that has been out for
decades. It uses a light bulb as a heat source. It doesn't bake very
well, but I'm certain it will be a whole lot worse with a CFL.

A more serious use of incandescent light bulbs is their use to warm eggs
and chicken hatchlings for chicken farmers. When these bulbs cannot be
sold anymore, where will the heat come from?

Another legitimate use of a light bulb is as a true voltage indicator
(that there is true voltage, as opposed to phantom voltage, between a
pair of wires). I'm sure a properly built tester can do this as well
(a gang of resistors and some indication such as LED, meter, or beep).

There are many other cases where light bulbs are used as a source of heat
(a function for which they are actually quite efficient at, wasting very
little of the energy in the form of radiation at light wavelengths) or as
a cheap dummy load (let's see if this 200 main breaker really kicks off
within 20 minutes at 250 amps). Of course heaters can be used to make
such a load, too.

Maybe we need to create a "heat bulb". There are such things as infrared
radiant lamps. But those don't work so well in all cases. What is needed
is something in the traditional light bulb form factor...