A wireless charger transfers power to a device using a technology called electromagnetic induction. It involves two components: a wireless charging pad (transmitter) and a compatible device (receiver).
The wireless charging pad contains a coil, or sometimes multiple coils, which are typically made of copper. When connected to a power source, an alternating current (AC) passes through the coil(s), generating a magnetic field around it.
The compatible device, such as a smartphone, smartwatch, or other electronic gadget, also has a coil built within it. This coil is aligned with the coil(s) in the charging pad. When the device is placed on the pad, the magnetic field generated by the charging pad's coil induces an electric current in the device's coil through mutual induction.
This induced current is then converted into usable direct current (DC) power by the device's internal circuitry. It charges the device's battery or powers its operations, similar to when a device is connected to a traditional wired charger.
Overall, the wireless charger transfers power by creating a magnetic field that induces an electric current in the receiving device, allowing it to charge wirelessly without the need for physical connections.