I recently got into arduino and salvaged some N-type MOSFET Transistors. I'm trying to power some motors with a 12v battery and control them with my arduino. I found that the transistor gate and source need to have a common ground. So instead of powering my arduino from a 5v phone charger battery, I'm powering it from a 12 volt battery and using a voltage divider circuit to cut the voltage to 6, and still be able to have a common ground with the battery and the arduino. I'm using two 220 ohm resistors in series to divide my voltage. For a few seconds they work just fine and I'm getting about 6v out of the resistors, however after a few seconds they both begin to burn up and smoke.
I'm wondering if maybe I'm doing something fundamentally wrong in the circuit, my resistors can't handle the .25 mA the arduino is pulling, or I'm just stupid.