how do you figure out cost per kilowatt-hour?

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Article #7011

#7011

From: Bob Billson
Date: Mon, 31 Aug 1992 20:28

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I need to determine how much some particular electronic is costing me to run.
For the sake of example, I need to know the cost of running something consuming
100 watts, all day long, all month long.  I know the cost the power company
charges per kilowatt-hour.  Can someone provide an equation to convert the
equipment's power rating to kilowatt-hours?

Simply using:

         (power_rating/1000) * hours_used * days_used

does not work out correctly (or so it seems).  Help? :-)  Thanks

       Bob
-- 
  Bob Billson, KC2WZ                          | internet: bob@kc2wz.bubble.org
                                              |           kc2wz@amsat.org
  $nail:  21 Bates Way,  Westfield, NJ 07090  | uucp:     ...!uunet!kc2wz!bob
                  C code.  C code run.  Run code run...<please!>

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Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!sun-barr!ames!agate!stanford.edu!rutgers!bobsbox.rent.com!s4mjs!kc2wz!bob
From: bob@kc2wz.bubble.org (Bob Billson)
Newsgroups: sci.electronics
Subject: how do you figure out cost per kilowatt-hour?
Summary: need for figure out costs for power consumption
Message-ID: <124@kc2wz.bubble.org>
Date: 31 Aug 92 20:28:42 GMT
Distribution: na
Organization: Color Computer 3: Tandy's 'game' machine
Lines: 18