iPhone 2.0: Solar-Powered Mobility - Forbes.com
iPhones are remarkably advanced devices that are small but consume considerable amounts of power. According to Filler’s calculations, it would take 250,000 to 1 million solar-powered wrist watches to generate the energy needed to power one iPhone (and keep the watches ticking). In other words, “the rate of energy consumption of the iPhone is about 250,000 to 1 million times larger than a standard sports wrist watch.” Filler’s calculation is for power consumption rates when both are being used, and take into account that the watch is used 24/7 while the iPhone is used for periods of time and then stored.
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