Am 02.09.2011 22:04, schrieb Horace Heffner:
The above makes no sense to me. Resistor wattage ratings are merely
the maximum wattage that can be put though them without the
expectation they will be destroyed. The power ratings are not used to
compute the power or current through them. If you put 600 W through a
300 W resistor you can expect it to soon burn out.
The printed values are the recommended safe operation conditions, not
the maximum rating.
With this type of heater resistors, the maximum rating depends mostly on
cooling and can be multiply exceeded with good cooling.
The problem is, then the voltage must been increased above 230V. P=
U^2/R. For double power the voltage must be 1.41*230V.
However, if I compare this resistor with the heater coil inside my
hairdryer, then the coil in my hairdryer is much smaller and it has
1200W. So, with good cooling, the resistor could deliver about 4 times
the wattage. Maybe the lifetime could decrease, but it should be possible.
