Wireless charging relies on electromagnetic induction for power delivery. While there’s certainly more science to it than that, the basics of how wireless charging works are simple. Electromagnetic induction is the transmission of electrical energy through a magnetic field. But how does that power get from a wireless charger to your device?

Alternating current creates fluctuations in the magnetic field, which produces energy. These fluctuations allow a compatible device’s battery to recharge when placed on or near a wireless charger. The specific designs and implementation will vary, but the same basic principle holds true whether you’re wirelessly charging smartphones or electric cars.

NOT QUITE WIDESPREAD YET

There are important logistical issues that make wireless charging difficult to expand along just one pathway. The infrastructure associated with new technology can be costly and disruptive, but there has been rapid growth in wireless charging tech and the now ubiquitous Qi wireless charging standard.

WHAT IS THE QI WIRELESS STANDARD?

The Wireless Power Consortium has designated Qi (pronounced chee) as the worldwide mobile charging standard for 5 to 15 watt personal electronics like smartphones. In the same way Bluetooth and USB charging cords are standardized to simplify computing for everyone, Qi is taking root as the way wireless charging is offered.

HOW TO USE A WIRELESS CHARGER

Wireless charging technology has a short range, so you often need to place your device on the actual charging station. With a charging pad, simply place your device on the pad just like you would put a mouse on a mousepad. Some docks have more complicated designs or a holster configuration reminiscent of a conventional wireless phone station.