In article , Michael A. Terrell wrote:

(Snipped because I found it less-relevant-than-I-expected to the subject
line)

I was expecting to see stuff about power consumption by "wall warts".

Those have been called "vampires" by being 2-pronged/"fanged" constant
consumers of small amounts of electrical energy that can become somewhat
significant in terms of electrical energy consumption if one has several
being powered 24/7, though this is well behind a refrigerator and behind
most climte control and lighting electricity demand.

I do believe that there should be some "energy efficiency" requirements
of those.
I find many "switchmode" cell phone chargers to do well in that area, as
I estimate from their heat output when loaded (mostly somewhat less than
that of wallwarts" with iron core physical transformers) and when
unloaded or largely-unloaded (they become outright cool to the touch when
being connected to a cellphone that has detected that its battery got
fully charged).

I also see many "wallwarts" with more-traditional iron core transformers
easily consuming a watt or two less apiece if they get made with heavier
gauge wire, more turns of wire per unit area of
wound-around-core-cross-section, and/or thinner core material laminations
preferably of some decent material - preferably "29M6" or only one or two
minor steps cheaper than that. Maybe requiring next larger size (usually
step up in most-traditional inch measurements for an "E-I" transformer
core has longest dimension upped 5/16 inch, another upped 1/4 inch
and the third upped 1/8 inch, and there are often some options to more
mildly increase only the "stack thickness" of a laminated core by 1/8 inch
that will even alone fairly often do well).

- Don Klipstein )