Hi Increasing the resistance doesn't change the power needed to pull in the armature, all it does is decrease the time constant for a particular inductance. Higher voltages require more resistance in the wire, meaning more turns. The pulling effect on the armature is just ampere-turns. Using more resistance just means higher voltage. E^2. One can do the same thing by adding a resistor in series with the 6V coil and using a higher drive voltage. Power wise, it is a loss. You still need the effective 25mA in the coil. Dwight Dwight