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2. Inductive charging - Wikipedia

   en.wikipedia.org/wiki/Inductive_charging

   Inductive charging (also known as wireless charging or cordless charging) is a type of wireless power transfer. It uses electromagnetic induction to provide electricity to portable devices. Inductive charging is also used in vehicles, power tools, electric toothbrushes, and medical devices.

3. Qi (standard) - Wikipedia

   en.wikipedia.org/wiki/Qi_(standard)

   Qi (/ tʃ iː / CHEE) is an open standard for inductive charging developed by the Wireless Power Consortium.It allows compatible devices, such as smartphones, to receive power when placed on a Qi charger, which can be effective over distances up to 4 cm (1.6 in). [1]

4. Wireless power transfer - Wikipedia

   en.wikipedia.org/wiki/Wireless_power_transfer

   In general a wireless power system consists of a "transmitter" device connected to a source of power such as a mains power line, which converts the power to a time-varying electromagnetic field, and one or more "receiver" devices which receive the power and convert it back to DC or AC electric current which is used by an electrical load.

5. Samsung Gear S3 - Wikipedia

   en.wikipedia.org/wiki/Samsung_Gear_S3

   The Samsung Gear S3 is a Tizen-based circular smartwatch developed by Samsung Electronics. It was released on 18 November 2016. [1] There are two models of the Gear S3, Classic and Frontier. The Classic has a silver watch case and black leather band, while the Frontier has a black watch case and rubber band.

6. Wireless Power Consortium - Wikipedia

   en.wikipedia.org/wiki/Wireless_Power_Consortium

   Official specifications of the Qi interface standard and the example of the standard in use by a charging pad and the compatible device. The Wireless Power Consortium was established on 17 December 2008. It officially published the Qi interface standard and the low-power specification in August 2010. In October, Nokia joined the WPC. [31]

7. Resonant inductive coupling - Wikipedia

   en.wikipedia.org/wiki/Resonant_inductive_coupling

   Some of these wireless resonant inductive devices operate at low milliwatt power levels and are battery powered. Others operate at higher kilowatt power levels. Current implantable medical and road electrification device designs achieve more than 75% transfer efficiency at an operating distance between the transmit and receive coils of less ...

8. Near-field communication - Wikipedia

   en.wikipedia.org/wiki/Near-field_communication

   The NFC Forum has developed a specific wireless charging specification, known as NFC Wireless Charging (WLC), which allows devices to charge with up to 1W of power over distances of up to 2 cm (3 ⁄ 4 in). [17] This capability is especially suitable for smaller devices like earbuds, wearables, and other compact Internet of Things (IoT) appliances.

9. Electromagnetic induction - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_induction

   Electromagnetic or magnetic induction is the production of an electromotive force (emf) across an electrical conductor in a changing magnetic field. Michael Faraday is generally credited with the discovery of induction in 1831, and James Clerk Maxwell mathematically described it as Faraday's law of induction .