I am looking for a low resistance resistor to put in my circuit to lower the current slightly. My circuit is/will be running off a 12 power supply and normally will draw somewhere between 11 and 13 amps under normal operation. I would like to add in an additional maybe .5 to 1 ohm resistor so as to make sure not to over load the power supply (it currently is if I leave it unattended for too long). Obviously, when I stick in an extra resistor into my circuit and run that many amps through it, after a while, it is going to get very hot. I want to make sure I get a resistor which will resist getting too hot. I know that resistors have a power rating, but I am not sure whether I am looking for a high power rating or a low power rating. Does the wattage on a resistor tell you its heat dissipation or accumulation? In other words, for a given resistance, would a higher or lower wattage resistor stays cooler?