This is not a very useful response to your question, Lenny. I have no idea about the losses, but I will comment on your problem with coiling the long extention cords.
>From my days in rock climbing, I learned that a regular circular coil is not the best way to handle long ropes. With each loop, you put a full twist into the rope, then when you drop the rope, it tends to twist up and even get into tension knots. We use what is called a butterfly or back packer coil. I don't think I can explain it here without it sounding much more complicated than it really is. Much easier to show someone than explain it. Anyway, that is how I package up my long extension cords and they are much better behaved than when I just try to coil them into a continuous loop. -- Blue skies. Dan Rossi Carnegie Mellon University. E-Mail: d...@andrew.cmu.edu Tel: (412) 268-9081