What is wireless charging and do I need it?
In most cases wireless charging is slower than charging via a cable for smartphones that include fast-charging technology, such as the Galaxy S8.
Some wireless chargers are faster than others, with modern higher-powered chargers capable of fully charging a large battery smartphone in around two hours. They’re typically rated by wattage, with 5W and 10W chargers common, or by output amperage, with 1A at 5V wireless chargers comparable to a standard 1A USB cable charger such as that that comes with the iPhone 7.
What’s ‘Qi’ wireless charging?
There are a couple of competing standards in the wireless charging industry designed for portable gadgets such as smartphones. Most smartphones support both the Wireless Power Consortium’s Qi and the PMA or AirFuel Alliance standards, meaning that they will work on most available chargers.
Qi is rapidly becoming the most popular wireless charging standard, and the one used by Apple for its new iPhone 8 and iPhone X.
How does it work?
Wireless charging works by transferring energy from the charger to a receiver in the back of the phone via electromagnetic induction. The charger uses an induction coil to create an alternating electromagnetic field, which the receiver coil in the phone converts back into electricity to be fed into the battery.
They typically have to be in close proximity to each other and correctly aligned over the top of each other, although a set orientation is normally not necessary.
Rechargeable toothbrushes and other bathroom accessories have used inductive charging since the 1990s.
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