Quote
lucamax
If you want to get 100 Watt from a 48 Watt resistance you will overheat the resistance and in a short time it will burn.
Not if you apply better cooling than still air or stop heating when some temperature is reached. Look at extruder heating resistors: they're spec'd for 3W and get heated with 25 Watts. They don't burn, because heating stops when temperature is reached.