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(Yahoo)   Fark your compact fluorescents, I'll save money by replacing my old bulbs with iPads   (finance.yahoo.com) divider line 11
    More: Interesting, cfl bulbs, electricity consumption, Electricity, iPads, Electric Power Research Institute, tablet computer, credit ratings, desktop computers  
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2592 clicks; posted to Geek » on 22 Jun 2012 at 10:51 AM (3 years ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



11 Comments   (+0 »)
   
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2012-06-22 11:14:16 AM  
That's a pretty crazy-low figure. Just goes to show the amount of energy savings that you can get when you just sort of try a little. Thanks, mobile revolution, for making everyone give a damn about efficiency!
 
2012-06-22 11:22:31 AM  
I'm going to have to be a bit skeptical. I mean, is this the amount of money it costs to charge an iPad and then do nothing with it for a year? I don't know about iPad's, but using GPS location or wifi eats through my smart phone's battery with a vengeance.
 
2012-06-22 11:22:36 AM  
LED Bulbs are cheaper and don't emit smug
 
2012-06-22 11:31:49 AM  

dantheman195: LED Bulbs are cheaper and don't emit smug


They leave the smug emissions to their advocates, it would seem.
 
2012-06-22 11:34:04 AM  
It's math time!

So, a quick google search says the iPad uses 2.5 Watts of power.
So, let's assume you use the iPad for... *pulls number from butt* 4 hours a day. Maybe some days you use it less, some more, but let's say you average 4 hours a day all year.

365.25*4*2.5 = 3652.5 watt hours or 3.6525 kilowatt hours.

I'm not sure what my going rate is for electricity, but let's say $0.20/kWh
3.6525*0.2= $0.73 cents.

So, either TFA is paying closer to 40 cents for their kWh or they're estimating 8 hours of use a day.
 
2012-06-22 11:34:19 AM  

Mytch: I'm going to have to be a bit skeptical. I mean, is this the amount of money it costs to charge an iPad and then do nothing with it for a year? I don't know about iPad's, but using GPS location or wifi eats through my smart phone's battery with a vengeance.


I very much suspect it's based on an "average" across a pool of users. There are probably tons of outliers.
 
2012-06-22 11:39:26 AM  

Honest Bender: It's math time!

So, a quick google search says the iPad uses 2.5 Watts of power.
So, let's assume you use the iPad for... *pulls number from butt* 4 hours a day. Maybe some days you use it less, some more, but let's say you average 4 hours a day all year.

365.25*4*2.5 = 3652.5 watt hours or 3.6525 kilowatt hours.

I'm not sure what my going rate is for electricity, but let's say $0.20/kWh
3.6525*0.2= $0.73 cents.

So, either TFA is paying closer to 40 cents for their kWh or they're estimating 8 hours of use a day.


That's surprisingly low. Maybe I've just underestimated the efficiency of modern portable electronics.
 
2012-06-22 12:02:34 PM  

Honest Bender: It's math time!

So, a quick google search says the iPad uses 2.5 Watts of power.
So, let's assume you use the iPad for... *pulls number from butt* 4 hours a day. Maybe some days you use it less, some more, but let's say you average 4 hours a day all year.

365.25*4*2.5 = 3652.5 watt hours or 3.6525 kilowatt hours.

I'm not sure what my going rate is for electricity, but let's say $0.20/kWh
3.6525*0.2= $0.73 cents.

So, either TFA is paying closer to 40 cents for their kWh or they're estimating 8 hours of use a day.


Down here in Texas it can be around 10 cents per kWh if you look hard enough. That woks out to 16 hours a day.
 
2012-06-22 12:24:19 PM  

Honest Bender: or they're estimating


"... Vairmohan measured the amount of power used to charge up an iPad with a drained battery. He assumed that users would charge up every other day. Over a year, ... the iPad consumed 11.86 kilowatt-hours of electricity.

The juice would cost $1.36 at the U.S. average residential price of 11.49 cents per kilowatt-hour"
 
2012-06-22 03:13:57 PM  

Honest Bender: It's math time!

So, a quick google search says the iPad uses 2.5 Watts of power.
So, let's assume you use the iPad for... *pulls number from butt* 4 hours a day. Maybe some days you use it less, some more, but let's say you average 4 hours a day all year.

365.25*4*2.5 = 3652.5 watt hours or 3.6525 kilowatt hours.

I'm not sure what my going rate is for electricity, but let's say $0.20/kWh
3.6525*0.2= $0.73 cents.

So, either TFA is paying closer to 40 cents for their kWh or they're estimating 8 hours of use a day.


For the ipad 2, Apple states it uses 3 watts, at idle with display on

For the new ipad, Apple states it uses 5.26 watts, at idle with the display on

So the $1.36 is correct. If you just had the ipad sitting, not doing anything, with the display on for a few hours every day. I doubt this is how the device is used.
 
2012-06-22 07:37:31 PM  

soj4life: For the ipad 2, Apple states it uses 3 watts, at idle with display on

For the new ipad, Apple states it uses 5.26 watts, at idle with the display on

So the $1.36 is correct. If you just had the ipad sitting, not doing anything, with the display on for a few hours every day. I doubt this is how the device is used.


From TFA, I thought they were measuring how much it cost to charge it every other night, not how much it cost to leave it plugged in while using it.
 
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