The Wonder Stone ran out of power and cannot move anymore.
How can you recharge multiple stones all at once?
Professor
First, we put the stones into this box.
(*Tossing stones into the box*)
Inductor
!!
Hey!
Weren't you just talking about being friendly to the environment?!Don't throw them away!
Professor
H-Hold on!This isn't a garbage can!
Inductor
Oh... Sorry about that. I didn't know.
Professor
This is the stones' charger.
Capacitor
This box?!How does it recharge them?
Radio waves inside the box recharge the stones wirelessly!
Professor
This is a recharging method known as the Wireless Power Transfer method
Capacitor
Th-That's a difficult-sounding word...
Professor
Indeed.
To put it simply, it's a technology that lets you recharge things just by putting them inside the box.
The stone contains a special device used for recharging.This device receives radio waves that are being sent out inside the box, which recharges the stone.
Professor
You know how bakeries bake lots of bread at once in a big oven?This is similar to that.
Inductor
Hmm. I've never really seen anything like this before.
Professor
It's cutting-edge technology that is still in the experimental phase, after all.
Capacitor
Why did you decide on this method?
Professor
Imagine having to hook up each stone to a different cable when you want to recharge them all at once. They’d get all tangled up.
This way, I can recharge them all at once by just putting them in a box. Nice and easy.
Capacitor
I see.
I always thought you placed the device on a charger to recharge wirelessly.
Professor
That is one of the methods, indeed.However, if the device slides off the charger, it may not recharge properly.
If it's a box, you can recharge it without having to worry about where you put it.The Wireless Power Transfer method is perfect for when you want to recharge multiple devices at once.
Capacitor
I guess there's lots of way to recharge wirelessly.
How does wireless recharging work?
Professor
Ahem.
I'll take this opportunity to teach you how wireless recharging works.One common way is known as the “electromagnetic induction method.”It's used in things like smartphones and electric toothbrushes.
Inductor
Another difficult word...
Professor
This method places the device on the charger, as Capacitor mentioned earlier.
There is a “coil” inside both the charger, which sends electricity, and the device, which receives electricity...
When the two coils come near each other, it generates “magnetism,” and turning magnetism into electricity lets you recharge!
Capacitor
Oh! “Magnetism” came out when we were talking about LF antennas, too.
Professor
Exactly!
Where there's electricity, there's magnetism... They're very closely related.
The great thing about the electromagnetic induction method is that it's compact and can recharge quickly.However, the device must be placed very close to the charger, so it has limited use.
Inductor
I guess it's not all-purpose.
Professor
There is another similar method, called the “magnetic resonance coupling method.”
It can recharge devices that are farther away than the electromagnetic induction method.
Capacitor
Th-These are starting to sound like magic spells...
Professor
Next is the last one.
It is known as the “electromagnetic wave reception method.”
It turns electricity into electromagnetic waves and sends them out with antennas. It can recharge devices that are almost ten meters away.However, it cannot recharge very quickly, and you need to be wary of people and the environment.
Inductor
I guess every method has its ups and downs.
Professor
Exactly.It's important to use the best method for a given situation.
Wireless charging is a new technology, so people are still coming up with different ways to use it.
The Wireless Power Transfer method that the Wonder Stone uses allows you to recharge the stone just by placing it in a box, even from a distance.
It combines the good parts of both electromagnetic induction and magnetic resonance coupling.
Inductor
It's important to use the appropriate method depending on what you want to recharge, right?
An infinite number of ways to use the “box”?!
Inductor
But isn't it a pain to use a box just to recharge the stones?
Professor
Hm. Do you really think so?How about a video game console?Don't you put it away in a toy box or a case after you're done?
I think it would be nice if it recharged when I just put it away.
Inductor
Well, that's fair...
Professor
How about when you put your clothes or bags inside a locker at school or work?Think of the locker as the “box.”
You won't have to worry about forgetting to charge your smartphone or earbuds if they recharge in your locker.
Capacitor
Wow, that might be really useful!
Professor
It hasn't been realized yet, but there are endless possibilities from just thinking about it as a box.Let's all think of different ways we can use it!
Inductor
I'm getting excited!
Capacitor
The Wonder Stone really is packed with all sorts of futuristic technologies.All this talk about the stone is really making me want to go to “Yumeshima.”
Inductor
Me too!
Professor, take us to Yumeshima.
Professor
A-All right.
But you can't enter Expo 2025 without a “ticket”...
Capacitor
Really?
I guess the two of us will have to go look for a ticket, then.
Inductor
Yeah. It's not like Professor will want to leave the house anyway.
Professor
I run out of power when I go outside...
Inductor
You know it's actually unhealthy not to get any sun!
Capacitor
Okay, let's go look for tickets for Yumeshima!
Professor
Be careful out there!
To be continued
Summary
The “Wireless Power Transfer” is a brand-new wireless recharging technology.
It is a useful technology that lets you recharge multiple stones at once, just by placing them in a box!
