Quote:
Originally Posted by Cinisajoy
My husband's cell phone says unplug to save power when it is charged.
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Have you ever measured the powerdraw of a cellphone charger charging a charged phone?
I did.
My Killawat meter can measure upto 0.5W. Anything below is registered as '0W'.
While I'm sure it's not 0W, even if it was 0.5W, do you know how much it costs you to keep it plugged in 24/7 for a whole year?
In USA the math is very simple.
As a rule of the thumb, you look at the wattage the device uses.
Take that number, and that's the amount of dollars you pay, leaving it plugged in 24/7 for a whole year.
In other words, if you have a 60W lightbulb, and keep it burning for a whole year, 24/7, never turn it off,
it'll cost you roundabout $60 that year on electricity.
That being said,
If the charger with phone on fully charged, or even without phone, was plugged in 24/7, it will cost you less than $0,5 per year on electricity.
Not worth the cost of unplugging and risking battery loss over here...