l i n u x - u s e r s - g r o u p - o f - d a v i s
Next Meeting:
July 7: Social gathering
Next Installfest:
Latest News:
Jun. 14: June LUGOD meeting cancelled
Page last updated:
2003 Jan 31 18:43

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

Report this post as spam:

(Enter your email address)
[vox-tech] [OT] Electrical Engineering Question
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[vox-tech] [OT] Electrical Engineering Question

I got my first electric bill at the new house; looks too
high.  So I decided to do an experiment.

Outside the house is an electric meter.  It reads KWH
accumulated on 5 dials, and has a horizontal platter that
appears to spin about 100 revolutions per KWH (anyone know
if this is exactly true for a standard meter?).

So I figure that means 10 watt-hours per rev, or 36,000
watt-seconds per rev.

I timed one revolution with most things in the house turned
off.  45 seconds.  Then I turned on a 250W light bulb and
timed it again.  32 seconds.  So:

  36,000 watt-secs / 45 secs =  800 watts
  36,000 watt-secs / 32 secs = 1125 watts

  1125 - 800 = 325 watts -- for a 250W bulb.

How come?  Should I complain to PG&E, or is there some
gotcha that I'm missing?


-- Rod

vox-tech mailing list

LUGOD Group on LinkedIn
Sign up for LUGOD event announcements
Your email address:
LUGOD Group on Facebook
'Like' LUGOD on Facebook:

Hosting provided by:
Sunset Systems
Sunset Systems offers preconfigured Linux systems, remote system administration and custom software development.

LUGOD: Linux Users' Group of Davis
PO Box 2082, Davis, CA 95617
Contact Us

LUGOD is a 501(c)7 non-profit organization
based in Davis, California
and serving the Sacramento area.
"Linux" is a trademark of Linus Torvalds.

Sponsored in part by:
Appahost Applications
For a significant contribution towards our projector, and a generous donation to allow us to continue meeting at the Davis Library.