The reason is that they are not transformers but switched mode power supply which use an electronic circuit to do conversion and step down.
Best
PKS
On 09 Apr 2015, at 23:43, "Jim Saklad jimdoc@icloud.com [apple-iphone]" <apple-iphone@yahoogroups.com> wrote:
… it is way too much overkill since it supplies 120v which you then downsize to say 5v (which wastes a lot of energy).Transformers in general, and specifically the one in an Apple iPad-charging "wall wart" wastes VERY little energy. As evidenced by the fact that that it gets only a little bit warmer than ambient temperature.
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Posted by: Pabitra Saha <pksaha000@yahoo.co.uk>
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