2009/9/19 John Fields <[email protected]>: > I don't know the intensity of the fields shown in the videos, but my > concern would be that in a field of sufficient intensity to charge a > cell phone battery would also be capable of heating rings, necklaces, > and the like.
In the photo here: http://cheeju.files.wordpress.com/2007/06/wireless-grp1-enlarged.jpg one of the guys in the beam is wearing what looks like metal rimmed glasses, with no sign of discomfort. > Do you have any actual numbers relating the extension of battery life > and its savings on replacements to the cost in manufacturing and > operating the large charging system you envisage? I haven't got precise numbers but the cost of electricity from a battery is a few thousand times more than that of electricity from the grid, so it shouldn't be hard to make savings by drawing a little less from the battery and a little more from the grid. > What I disagree with is that any system designed to send electricity > "wirelessly" will ever exceed the efficiency of a properly designed and > operated wired system, and will, consequently, waste power. Not if you consider the global cost and energy balance for equipment which would otherwise be battery powered. Michel
