Since the mass commercialization of cell phones in the 1980s, the devices have always been charged with a charger that connects to the phone with a long cord. However, conventional charging could be problematic due to unavailable or inaccessible electrical cords. Now, wireless charging technology promises to change all that.
There are many approaches in wireless charging, and the inductive approach is the most common. Similar to conventional chargers, a wireless charger, normally called a charging station, also has a plug that connects to an electrical socket. It differs from conventional types in that it has no physical cord that connects with the devices.
Inside the small charging station are one or more sets of coils. The cell phone has the similar set of them as well, which couple with the ones in the station. By using alternating current (AC) electricity from your house, the coils in the station generate a magnetic field that transmits energy to the coils inside the phone. The energy is then transformed into current, which will charge the battery.
The advantage of wireless charging is simple—no more cords. Sadly, there are currently quite a few disadvantages to going wireless. Since most mobile devices do not have the coils installed, the user would have to attach the coils to phones as an accessary. Most importantly, the charger itself is considered by many to be costly, since it runs at least 100,000 won.