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Something usefull...as seen on Ask this old house...

Buy two so you can see how much this device is costing you.

i bought one of these for like around 20 bucks before. Used it for one day and it's collecting dust in THE DRAW.

nvm

how much does 100 watts per hour cost?

Depends on how much your utilities provider is charging you for each KWH.
100 watts for one hour is 1/10 of that cost, 1KWH= 1000 watts running for 1 hour.

like others have stated, would be fun for a while, then boring.

plug the power strip of your Christmas tree decorations into this.

#8 I think that would be a great idea for the year. Then you would get to enjoy watching the bill before it comes.

The biggest improvement over the previous model (P4400) is the battery backup feature. With the old one, if you were collecting usage data for a month and power went out on the 29th day even for 1 second, you'd lose everything. This one will pick up where it left off.

#3 and #7. See #10's comment. You can do logging of usage over extended periods to guage how you use power. That feature can be quite handy.

It is interesting to put it on your gear when it is off. Then you see what is costing you so much every month.

I thought electricity rates vary depending upon time of day (peak vs. nonpeak) ?

100 watts for an hour = 0.1 kilowatt hours

1 kilowatt hour = $0.10 (depending on where you live)

Therefore, to run 100 watts for an hour will cost you about one cent.

I have one of the older units, and it comes in handy from time to time. You can determine how much power a wall wart is wasting, whether it's worth turning off a laptop as opposed to just letting it "sleep" or "hibernate", etc.
It's like any other tool, g, a wrench. Most of the time it just sits in the drawer. When you need it, though, you need it!
If I needed another one, I'd look for an older unit, which typically goes for more like $20, I think. I have other tools to do multiplication for me -- though I generally don't bother calculating cost of electricity.

Yeah the other one is less than half the cost. These calculations are simple to perform.

Just look at how many watts the thing your plugging in takes and turn it into kilowats by moving the decimal around. then for every hour thats what it costs based on how much you pay per kilowat hour. Can be found on your utility bill for those of you who dont live with mommy anymore.