Best guess for a new demo...
Maybe a 1 ohm on the ‘input’ and a 1 ohm on the ‘output’ and compare to show the glowcat making more than input?
It is beyond trivial to install a revenue accurate meter on the power inputs of the entire Ecat.
Then you measure the “energy out“ provided by the Ecat divide that by the
“Energy in” to to the Ecat and viola.
This continuous sleight of hand, pay no attention to the human behind the curtain
chicanery of measuring voltage drops across resistors, negative frequency, upside down power factor reading s are just a meaningless smokescreen to keep the gullible fooled.
There are no industrial customers anywhere on planet earth that would ever fall for this tripe. Now, on planet Rossi, probably.