How can the energy cost of an electronic device over a span of time be calculated?

February 21, 2006 10:56 AM

How can the energy cost of an electronic device over a span of time be calculated?
posted by airguitar to Science & Nature (5 answers total)

By hand or with a specialized measuring device (or this one).
posted by GuyZero at 11:03 AM on February 21, 2006

I have that thing odinsdream linked to. It works great and is the only way to go if you have something that is variable speed (like an air filter).
posted by smackfu at 11:04 AM on February 21, 2006

wattage * time turned on / 1000 = Kwh.
posted by delmoi at 11:30 AM on February 21, 2006

Response by poster: Thanks all. Just what I was looking for. This also is interesting: Electric Appliance Operating Cost List
posted by airguitar at 12:10 PM on February 21, 2006

In delmoi's equation, time is in hours (e.g. 30 minutes = 0.5 hours).
posted by intermod at 8:01 PM on February 21, 2006