On Monday, July 27, 2015 at 6:09:33 PM UTC-4, Ralph Mowery wrote:
"Cursitor Doom" wrote in message
...
Thank you, gentlemen.

So we're all agreed:

1. there's no problem using wire-wounds for a load provided the power
output measurement is carried out with sine waves from a suitable
external generator.

2. Even low rated power resistors can be used for the load provided their
case temperatures are kept low by some effective means of external
cooling (something more than mere heat sinks and fans, IOW).


That is the way I see it.

You can probably go at least 5 and maybe 10 times the power on the load
resistor if you put it in some water or oil. Many times that if you have
liquid nitrogen.

NO!!!!

Most metallic conductors are Zero-Resistance at cryogenic temperatures. So, a wire-wound resistor may drop off to near-zero in liquid nitrogen.