The electricity costs of plugging in that iPhone charger can add up over time. So how much are we talking about to keep your iOS device charged for a full year?
According to Opower the iPhone 5 costs a total of $0.41 per year. The iPhone 4 came in even lower, at an annual electricity cost of 38 cents.
Compared to larger consumer devices such as notebook computers and flat-screen televisions, the iPhone is a power sipper.