Wireless charging technology uses two physical phenomena, current magnetic effect and electromagnetic induction.
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Current magnetic effect means that an energized coil will produce a magnetic field, while electromagnetic induction means that an unenergized coil will generate an induced current in a changing magnetic field. Wireless charging base and wireless charging mobile phone (or tablet, headset) respectively have built-in coils. When the wireless charging base is powered on, alternating current flows along the coil of the charging base, resulting in a changing magnetic field, the direction of which is perpendicular to the coil plane. When the mobile phone (or tablet, headset) is close to the wireless charger, The phone's internal coil generates an induced current in the changing magnetic field to charge it.