Wireless charging seems so great, I plug this
thingy in and then set this other thingy on it… BAM power! But how the heck does electricity
get from the wall into my phone? Hello everyone! Trace here for DNews, thanks
for stopping by! You’re probably watching this show via a device that has a battery.
Laptops, mobile phones, toothbrushes, though… not this new watch everyone’s talking about
for some reason… All these things need charging and for the moment we’re still using cords
and plugs for this… Inductive charging isn’t new, it’s been used since the early 1990s
in electric toothbrushes, and for surgically implanted devices like artificial hearts.
You’ve even heard of this in pop culture! In the late 1800s, Tesla was allegedly able
to power light bulbs with no wires, and claimed to be able to transmit power from one location
to another with no wires… To make it work relies on simple physics.
If you ever wrapped a coil of wire around a nail and attached a battery, then you know
the electricity in the battery runs through the wire creating an electromagnetic field,
or flux. Do it at home, it’s fun and you can use it to pick up paperclips or whatever. With that same principle, a coil of wire…
magnet… battery… you can make it go the other way too. Spin a magnet in the coil and
you’ll GENERATE electricity by taking that magnetic flux and moving it through that coil
to create electricity. The battery creates a stable electromagnet
because it’s direct current, it’s going one way. The power from your walls is alternating
current, changes direction 60 times a second — or cycles at 60 hertz — so the electrons
are moving back and forth — remember that because that’s the key to the charging. Wireless inductive charging gets its name
from that magnetic field interaction, called induction. Inside of the charging pad, and
the inductive charging device are tiny coils of wire. The pad, being plugged into the wall,
is fully powered — and the power is cycling. When the other coils come within a short distance
their flux will interact with the flux in the device, move the electrons around and
charge the battery. Chances are, the number of cycles per second
isn’t going to be 60 hertz, but like, 5 or 10, so it doesn’t mess up other things in
your house. Your WiFi network cycles at 2.4 gigahertz or 2.4 billion cycles per second,
so it’s DEFINITELY not going to mess THAT up, but with all the radio waves flying around,
you can’t be too careful. If it’s that easy, you’d think it would be
everywhere, but the problem is efficiency. You waste a lot of power filling up two coils
and letting them talk to each other. It’s SO much better to just plug right in. The future of wireless charging is unclear.
It seems like a great idea, but it’s still going to be a short-distance system for a
while. In 2006, MIT found if you match the frequencies of the devices, you can make the
power go a few METERS — so if you were in your living room, and a charger was there
— your phone would charge right in your pocket… They’re working on marketing the technology
now, but it’s still not everywhere… Mr. Tesla, we’re getting there, man. Speaking of awesome innovations – how about
ones that make flying a little less suckier? That happens to be the focus of discussion
on THIS episode of Anyhoo, hosted by my friend Catie Wayne. Check it out! Back to wireless charging – what would you
want to power wirelessly? I’d love to beam power to my TV! Then I could put it anywhere!
Down with cables! Leave your comments down below, Please subscribe and thanks for watching!