At least one of the rumored three new 2018 iPhones will use a copper wire coil for wireless charging rather than the FPC coil used by the iPhone X and iPhone 8, reports the China Times.FPC coils are thinner and smaller in size but have larger resistance and reduced efficiency.
In 2017, the iPhone uses FPC coils with 7.5W fast charge, considering the factors such as efficiency loss. The charging speed is actually slightly slower than the 5W wired charging. Because the FPC resistance is large, even if you want to achieve fast charging, the power should not be too high to avoid overheating. Apple chooses 7.5W, which is actually trying to achieve the same level as wired charging. Speed, and can not have overheating, but also want to consider the RX module thin and light.
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