Re: Wire-wound resistors as dummy test load

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Richard W. by way of Terry Fritz <twftesla-at-qwest-dot-net>" <potluck-at-xmission-dot-com>

Matt,
Resistors in series will only have the wattage of the lowest rated resistor.
In your case wiring them in series will give you 800 ohms at 200 watts.

Rick W.


----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, September 30, 2002 7:33 AM
Subject: Wire-wound resistors as dummy test load


> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Mddeming-at-aol-dot-com>
>
> I found 4 200-Ohm, 200-Watt wire wound resistors all the same brand, that
I
> thought I would string together as an 800 Ohm, 800 Watt, test load for my
TC
> power supply, while checking things such as PFC cap size, etc.  However,
when I
> checked them with my meters, I got these readings:
>
> 1) 205 Ohms 339 uHy
> 2) 206 Ohms 221 uHy
> 3) 210 Ohms 225 uHy
> 4) 208 Ohms 508 uHy
>
> Physically, they all seem to be the same size, shape, and construction,
but the
> variation in inductance seems unreasonable. Has anyone looked into the
> inductance of wire-wound resistors before? If so, is this reasonable? I
know
> that at 60 Hz, this only amounts to about 0.1 to 0.2 Ohms inductive
reactance,
> but it seems strange.
> TIA,
> Matt D.
>
>
>