I am running about 6.5W though a 10W resistor. The ohm rating is 220 ohms, which is correct for the circuit ohms which is calculated to about 225 ohms.
Here is what is running through my 220 ohm 10 watt resistor:
38.4V * 0.17A = 6.528W
Within a couple minutes it got so hot that it burned me. I'm ok though because I only touched it for a second.
But I was expecting it to stay cool since the resistor is rated at almost double the power that is going through it. The electronics people told me that it shouldn't get hot with double wattage.
Is this normal? Why would the resistor be getting hot? Also, is there a fire risk? p.s. The resistor is resting on brick.