Wireless Charging
<p >"<b>How Does Wireless Charging Work?</b>
Wireless charging, also known as inductive charging, uses an <a href="https://articles.mercola.com/sites/articles/archive/2018/01/08/reduce-emf-exposure.aspx">electromagnetic field (EMF)</a> to transfer energy between two objects. This is accomplished using a charging station that sends energy through inductive coupling to an electrical device that can use the energy to charge the batteries or run the device.<sup >5</sup>
While there has been a burst of excitement about wireless charging for mobile devices, the technology actually existed in the late 1800s. It was invented by Nikola Tesla who originally worked with Thomas Edison on DC-based electricity.
Unsuccessful in his pursuit of improvements to the technology, Tesla began working on AC-based electricity instead. He then invented the Tesla coil, laying the foundation for wireless technology.<sup >6</sup> The Tesla coil prototype is now on display at the Griffith Observatory, demonstrating on a large scale what's being done to charge your smartphone wirelessly.
The basic principle of transferring energy from one place to another remains the same. Called electromagnetic induction, a copper coil creates an oscillating magnetic field and a second coil converts the floating field back into energy again.
A second method, called magnetic resonance, allows transmission of power at greater distances by changing how much energy is stored in each coil and the coil size. In 2006, researchers from MIT proved they could transfer electricity up to 2 meters (6.5 feet) using magnetic resonance. Although 60 percent of the power was lost, their experiments enticed investors into further research.<sup >7</sup>
Today, there are two different methods of wireless charging. The first, the Qi Standard, uses the inductive method of small coils over short distances. This was created by a partnership of over 200 companies, including Apple and Samsung. The second type focuses on electromagnetic resonance. Previously known as Power Matters Alliance, AirFuel has been adopted by Duracell, Starbucks and Google."
source: <a href="https://articles.mercola.com/sites/articles/archive/2018/10/17/is-wireless-charging-safe.aspx">https://articles.mercola.com/sites/articles/archive/2018/10/17/is-wireless-charging-safe.aspx</a></p>