@Brad J posted:“more voltage is more current,” Wrong. Voltage is inversely proportional to current. Ie: voltage goes up current goes down, voltage goes down current goes up.
Note that Vernon was discussing the relay coil. Relay coils are NOT constant power loads...they are simply just that...a coil of wire. So if you put in more voltage you indeed draw more current. And in the context of O-gauge, you do need to mind the coil voltage specification if you are using a 12V AC coil relay and driving it with, say, Accessory 14V or 16V AC, or 18V AC Command AC. You may overheat and destroy the relay at higher than nominal voltage.
OTOH you may be referring to a "family" of relays of the same part number (but different voltage suffix) where you choose the coil voltage from popular voltages such as 6V, 12V, or 24V. In which case, yes, the coil power is constant. For example, a family of relays may have a constant 1/2 Watt power rating to operate the relay. So the 12V coil version draws less current than the 6V version. And the 24V coil version draws less current than the 12V version.
