Re: Input power measurement - Modifying Power Meters

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

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

At 04:19 PM 3/13/2003 -0700, you wrote:
>Original poster: "Matthew Smith by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <matt-at-kbc-dot-net.au>
>
>Hi
>
>IIRC, domestic (and others, I guess) energy meters (they measure kWhrs!)


Ahem, shouldn't we be SI here in tesla land.. they measure joules, and 
happen to have a scale marked in kWh. (no doubt as a result of the early 
Edison hegemony/conspiracy to meter electricty consumption, when everyone 
knows that electricity is "too cheap to meter")<grin>



>  feature a drag magnet - I think that this imparts a braking effect on 
> the disc.
>
>If you can get the thing open, see if this (permanent) magnet may be adjusted.


Clever idea... you're right... the crossed fields from the current and 
potential windings put a torque on the disk, and the drag magnet is what 
turns a torque into a velocity.