Wireless/Inductive charging[b][/b] uses an electromagnetic field to transfer energy between two objects through electromagnetic induction. This is usually done with a charging station. Energy is sent through an inductive coupling to an electrical device, which can then use that energy to charge batteries or run the device.
Induction chargers use an induction coil to create an alternating electromagnetic field from within a charging base, and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electric current to charge the battery. The two induction coils in proximity combine to form an electrical transformer.
Nikola Tesla was first demonstrated it in 1891 and its finding its use today.

Wireless Charging provides a convenient, safe, and reliable way to charge and power millions of electrical devices at home, in the workplace and in industry.

By eliminating the use of physical connectors and cables, wireless charging provides a number of efficiency, cost and safety advantages over the traditional charging cable.


From smartphones, to hand-held industrial devices and heavy-duty equipment applications, wireless power maintains safe, continuous, and reliable transfer of power to ensure all varieties of devices and equipment are charged and ready to go at a moment’s notice.

Advantages/Benefits:
Protected connections – No corrosion when the electronics are all enclosed, away from water or oxygen in the atmosphere. Less risk of electrical faults such as short circuit due to insulation failure, especially where connections are made or broken frequently.
Low infection risk – For embedded medical devices, transmission of power via a magnetic field passing through the skin avoids the infection risks associated with wires penetrating the skin.
Durability – Without the need to constantly plug and unplug the device, there is significantly less wear and tear on the socket of the device and the attaching cable.
Increased convenience and aesthetic quality – No need for cables.
Reduced cost associated with maintaining mechanical connectors. For example: Slip Rings
Safe powering or charging devices that need to remain sterile or hermetically sealed (waterproof)
Eliminate sparks and debris associated with wired contacts.

Disadvantages:
lower charging – Due to the lower efficiency, devices take longer to charge when supplied power is the same amount.
More expensive – Inductive charging also requires drive electronics and coils in both device and charger, increasing the complexity and cost of manufacturing.
Inconvenience - When a mobile device is connected to a cable, it can be freely moved around and operated while charging. In most implementations of inductive charging, the mobile device must be left on a pad to charge, and thus can't be moved around or easily operated while charging.

Applications:
Wireless charing for smartphones and tablets
Wireless charging for wearables
Wireless charging for AA battery powered devices.
Wireless charging for commercial applications where cables and connectors can become unreliable, dangerous or incur high maintenance costs.
Wireless charging of medical devices and equipments where traditional connectors become not only source of contamination, but are also a physical hazard as room configurations are constantly changing.
Wireless charging of electric vehicle; this could be carried out in a number of ways, including:
Parking spots & charging pads;with these pads built into specially designed parking spots, you’ll be able to charge your car while you’re grabbing your shopping or catching a movie.
Electrically charged highways of the future; with the charging devices built into the very asphalt itself.

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