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The suspicion is that the 70% efficiency is how much of the power arriving at the phone can be used for charging it, not much the transmitter is supplying.
by richardwhiuk 12y ago
The suspicion is that the 70% efficiency is how much of the power arriving at the phone can be used for charging it, not much the transmitter is supplying.
- johngd 12y agoMy car's USB port can barely charge my Samsung Galaxy 5.... I can't imagine how long it would take via radio wave.