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Without delving into the exact physical explanations: when electricity ‘travels’ through a copper wire, it provides an electromagnetic field. The inductive coil used for wireless charging has a special placement of copper wires to create a specific magnetic field. The magnetic field which is created by the sending coil (E.g. charging station) interacts with the receiving coil. In turn this magnetic field is turned into power by the receiving coil and then transferred to the device (E.g. mobile phone).
In other words: Electricity – sender coil – magnetic field – receiving coil – electricity.
Is wireless charging safe?
In short: Yes wireless charging is safe
The idea of wireless charging sounds rather dangerous, as you may think of electrical current running through one place to the other, or potential of harmful radiation. In truth it is however harmless. First of all, as you have read above, the power is transferred through the use of magnetic fields. There is in fact no electricity flying through the air, but magnetic fields, which exists around us everywhere already also.
Secondly, the objection of radiation is slightly more meaningful, but also does not apply. The technology of wireless charging has been used in electric toothbrushes for decades, without any indication that it could be harmful. The devices are also not omitting anything unless both coils reach each other and even then any radiation is insignificantly little due to the close proximity of the devices. In addition to this, the consortium behind Qi has further shielded both the sending and receiving coil, minimalizing any form of radiation.