---In apple-iphone@yahoogroups.com, <pksaha000@...> wrote :
> The reason is that they are not transformers but switched mode power
> supply which use an electronic circuit to do conversion and step down.
Absolutely. The transition from transformers to switched power supplies has saved a lot of energy and thus money and pollution.
Even switching power supplies draw some power when plugged in but not in use.
We can all do better. The latest estimates I have seen show between 1 and 2% of power generated in the US is wasted in chargers that aren't charging anything.
1% of 360,000 thousand megawatt-hours per month is 3,600 thousand megawatt-hours per month - the equivalent of four complete power plants.
If you aren't using it, unplug it.
dave
Posted by: dskolnick@gmail.com
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