26 Jan
2004
26 Jan
'04
7:34 p.m.
Oh man this thread is gettin' wacky!
Not only are there resistive loads, slightly-variable resistive loads,
phase-dominated AC loads, there are also ACTIVE loads, eg. 99% of
everything made today that uses a wallwart! The (example) telephone
draws little current quiescent, more when it rings, more when charging a
dead vs. full battery, a lot when you're talking, etc and nauseum.
They got them new-fangled micro-compu-compacitor thingies in 'em what
make's em all complicated. Chips, non-corn, silicon.
I think this dead horse of a thread is beaten into a thin film.
You CAN substitute wallwarts, but you gotta know what you're doing or be
lucky. If a device wants regulated voltage (eg. my Linksys WAP) it often
-- but not always! -- will say something like "5.0V x mA" on it. If a
device comes with a (say) 12V AC wart, you (the YOU that knows about
electronics, if you don't have a you that does, don't) you can
substitute a 13V, 14V, maybe even an 18V wallwart, even a DC one! Maybe.
There's no substitute for knowledge except exhaustive N x M matrix
testing with a lot of wall warts and many, expendable, copies of your
appliance. (Eg. stick with the non-smoking, functional combination.)
Someone else can have the last word. I gotta go charge my orgone
battery.
tomj
On Mon, 2004-01-26 at 14:19, Joe R. wrote:
At 01:22 PM 1/26/04 -0700, you wrote:
I take exception with your reply! While technically true, in this case
we were clearly talking about a battery powered telephone therefore we're
talking about pure DC with no AC. Therefore phase, frequency and impedence
are irrelevent. Throwing in the talk of impedence just to show off is only
confusing the issue. The orginal poster that thought voltage didn't matter
clearly doesn't clearly understand electricity and I didn't won't to
confuse him further by introducing AC and it's effects.
Joe
reason that your phone smoked was the it's
design relied on the internal
impedence (a fancy word for resistance(R) ) to limit the current. When you
Close, but although both are measuered in Ohms, impedence includes
another factor: Phase. Resistance is non reactive. That is, it does not
change with the frequency of the source voltage. Impedence is a
combination of resistance and reactance (capacitive and/or inductive),
and along with phase, can change with the frequency of the applied voltage.