[Amps] Non-Inductive Resistors

[Colin Lamb]

"I came upon the skeleton of an old mil-surplus
power supply that contained several non-inductive resistors.

There were 4 33,000 ohm and two 800 ohm units, all unmarked as to wattage, but at least (guessing) 100 watts.

They were all marked as to resistance, and all marked "non-inductive".
All are designed to fit into a largish fuse holder.

Just idle curiousity, but why would a power supply contain non-inductive resistors?"

They are actually quite inductive.  Some of the early power resistors used to be quite inductive at 60 Hz.  That was in the 30's.  So, when a new crop came out, they got marked NI or said non-inductive.  They are non-inductive only for low frequencies - not real radio frequencies.  

Colin  K7FM