Do you what is the nature of its output - electrical power, light, heat, mechanical?
You speak of resistance of the device and a controller- since he claims the device is self sustaining, how is the output converted for their inputs to keep it running without external input of power?
You are missing a vital word in the first sentence,
Rossi has stated this demo will be only of total heat.
I haven't seen figures for how long the E-Cat QX can run in self sustain mode. That fact that it does for at least part of the time helps the high COP.
I spoke of measuring the voltage across a known resistor and measuring the power into the controller. The resistance of the reactor is not known except that it is very low.
I don't understand your last sentence. I think the answer is that it isn't.