I have a small battery powered device (several blinking LEDs in a circuit) that require two 3V 30mAh "button-cell" batteries. I would like to power these with a transformer. I have a "wall-wart" style transformer that outputs 6V at 600mA. What type of resistor (if that is all) do I need to place in the circuit to reduce the current from 6V 600mA to 6V 30mA. I used an online calculator and the online book on this website, and I am guessing a 10 Ohm resistor might work, but am unsure of the wattage required on the resistor as well. Any help is appreciated. I did not have any electronics classes back in school