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 (6 comments total)

You could physically do it with something like this device, or you could manually calculate the usage by multiplying the theoretical watt usage by your electric billing rate.
posted by odinsdream at 11:01 AM on February 21, 2006

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

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