> I've checked with a voltometer where I found the difference in > voltage. (120V my place, 116-117V his place.) If my memory is > correct from my high school physics the current usages increases > exponentially if the resistance is the same and the voltage is > dropped.
Not exactly, Ohm's Law states that V=RI which is a direct correlation. What you are thinking of is power which is =VI or I^2 R which is an exponential relationship.
IMHO, I don't believe that a small variation on the AC side should affect the computer. The computer runs on DC which your power supply converts to from your AC wall circuit. The power supply generally has voltage regulators so that the DC voltages should not vary. Shawn has made some good points. The other thing you ought to consider is the peripherals that are plug into the computer. When I service a computer, I generally just take the box and not the keyboard, monitor or mouse. Though the computer works at your house, these are new parameters that are untested when you bring the computer back. If there is a short in the keyboard or mouse, the drain on the power supply will be detected and cause the power supply to shut down.
When dealing with family and saving face, I recommend going over to pick up the other peripheral pieces to try out at home. If you need to try a good line filter, I have a Tyco lying around somewhere that you can borrow. You can also try a UPS as well -- that would be the AC power supply and you can test it at home and at the clients -- that would also now become a constant.
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