iPads beat laptops by $7... in annual electricity costs

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A study by the Electric Power Research Institute has calculated that an iPad uses only $1.36 worth of electricity over a year. That's less than a 60W compact florescent light bulb, and a fraction of the usage of most laptops.

Device Annual Use Annual Cost
iPad 12 kWh $1.36
iPhone 3G 2.2 kWh $0.25
"Laptop PCs" 72.3 kWh $8.31
60W CFL Bulb 14 kWh $1.61

We aren't sure what the EPRI means by "Laptop PC." But a little back-of-the-evelope calculation for the iPad: 12 kWh/year ÷ 365 days ÷ 10W power plug = 3.28 hours per day of charging time. Sounds about right to me.

(via TUAW)

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