I have a Jetstream countertop oven that expects 110V at 60Hz. I have been using it lately in 230V country courtesy of a pretty massive stepdown transformer that is rated at 1500W but of course outputs 110V at 50Hz.
The oven seems to work okay (the electronics are fine of course since they are DC) and I suspect the motor is okay also since I would expect that to be DC also. But the perspex oven cover gets uncomfortably hot and has started to crack from the heat. I am wondering if this is because the actual heating element is rated for 110V at 60Hz operation and doesn't like 110V at 50Hz? From a distant past I recall that power for DC was Volts*Amps or I**2*R. But for AC you had to take the RMS value of the voltage rather than the nominal voltage? So potentially the heater is operating at a higher power (heat output) than it was designed for?
As an aside I recall my US house had to have 240V at 60Hz for a drier since not enough power could be supplied at 110V whereas in my local house abroad, since the entire house is wired for 230V 50Hz there is no need for a separate line for high current draw appliances.
Anybody who is more familiar with some of the basic electrical theory able to cast some light on this?
Thanks
Larry