On Sun, 27 Dec 2009 19:07:49 GMT, (Doug Miller)
wrote:

In article , terry wrote:

The more consistently higher voltages these days can have an impact on
older radios that were operated back when on, say 115 volts or less.
But which today often face 120 or higher.
Again (for simplicity) doing the V squared business, the difference
between say 113 volts and say 120 volts is almost a 13% increase

No, it's not. It's an increase of 6.19%.
An increase of 6.19% in voltage from 113 is 120 vots, but the
increase in POWER would be at least 13% because the resistance stays
the same, so when the voltage goes up, the current also goes up, and
the power is the product of the two.