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Energy flow, an ode to Tesla

GADGET: Noise Slimmest Qi Fast Wireless Charging Pad 

TECH SPECS: Syncs with smartphones and devices with Qi wireless charging technology

PRICE: Rs 2,199-Rs 2,249

BEST FOR: Fast wireless charging of smartphones 

American inventor Nikola Tesla was the first person who envisioned wireless charging technology way back in 1891. Tesla dreamed of supplying power through the air by creating a magnetic field between two circuits, a transmitter and a receiver.

For over a century, the technology had only a handful of practical applications, including a few electric toothbrush models. However, in recent times, wireless charging is having a resurgence in the field of healthcare, manufacturing and automobile industry, because it gives you the freedom to stay un-tethered in an Internet of things (IoT) world.

Wireless charging means, as the name suggests, you do not need to plug a cable into your smartphone to charge it. The wireless chargers introduced in some models of iPhone and Samsung are usually a charging dock where you put the phone face up to recharge its battery. They are supposed to reduce power consumption by minimising heat generation and increasing charging efficiency. The mechanism involves an open interface standard known as Qi (pronounced CHEE; from the Chinese word qi, which means "energy flow") that defines wireless power transfer using inductive charging over distances up to 4cm.

Some of these charging pads are quite expensive, especially those made for the iPhone but they are soon expected to become an essential accessory for smartphones.

Although I am quite happy with my traditional wired charger, I loved the cute wireless charging pad, produced by the start-up Noise. The charging dock is round, a little smaller than a compact disk. "Slimmest Qi Wireless Charger," claims the package. Just about 5.5mm thick, it has a minimalist design and a leather cover. The metal underside is an efficient heat dissipater that protects your mobile from overheating. There's a tangle-free USB power cable too, which can be tucked inside after you've charged your phone.

The charging pad is compatible with any device that has built-in Qi wireless charging technology. But fast charging is only supported with QC adapter and iPhones on iOS 11.2.

The only grouse is that it won't work if your phone is not compatible with Qi technology. And that is a whole lot of phones.

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