“The modern cellphone user is highly attuned to energy usage. I assiduously monitor my phone's battery, tracking its decline from morning to evening, and then its return to fullness. There are even special "advanced power strips" that help people save energy while charging their devices.
But the truth is that operating a smartphone doesn't require much energy. An iPhone 6 needs just 3.8 kilowatt hours of electricity per year, according to OPower, an energy data firm.”
The Energy in Things
October 17, 2014