Linus Tech Tips did a video on wireless power a while back. With a lamp-shaped thing on the ceiling, power was given to a toy car on the floor. It needed direct “line of sight” though. I wonder how well this WiFi technology could work through walls?
WiFi into electricity
1 Like
No will never work, it breaks the laws of physics.
It only breaks the laws of physics as we currently understand them.
I also believe that the laws of physics change over time and space.
I think the laws of physics should really be called “physics theory”
I prefer to keep an open mind.
Let’s agree to disagree 
2 Likes
So maybe Apple phones can have true wireless charging after all?.??.?.
Not anytime soon
Maybe one day. It won’t be in any current phones and it won’t be in any of the phones released in 2019. But maybe in a few years?
Essentially, the device will use a flexible radio-frequency (RF) antenna to convert electromagnetic waves, e.g. WiFi, into AC signals. Then, a semiconductor will convert the signal into DC voltage to power electronics (from this article).
2 Likes
I think it will be at least a decade
That’s a shame. Very long time away. Especially since they originally planned to have it 2018. But the method they used before caused cancer.
1 Like
From what I have read about this over the past few years, it’s a VERY slow charge. BUT, a constant charge. In other words, as you use it, the battery would drain much slower because it would always be charging, so it probably wouldn’t be so bad. But they do need to work on speed and delivery!
1 Like
No it’s how our universe works and so true for eternity. Electromagnetic fields obey conservation of energy so for any volume of space the field has be net zero. As we inhabit a 3D space means the field has to be inverse square so it’s either has to be very intense at the source so expensive or weak at the destination so feeble
Example of the former is the Sun but it’s not something we can touch. Example of the latter is a crystal radio.
You could solve it with a directed particle beam, like laser but risk blindness or a focused high frequency radio but risk cancer.
What we currently do is use electrons rather than photons they carry more energy per particle and to stop them scattering we use their charge to hop between the shell of atoms. Also known as a wire…
There is no principle of physics that says physical laws or constants have to be the same everywhere and always.
So let’s take, say, the speed of light, a constant. You say within this universe it could alter? I accept it could be different in a multi-verse but quantum field theory says it would be a constant as everything is moving at a constant of space-time.
1 Like
The whole multiverse theory is an interesting one but I was talking about this universe.
Here’s my source.
I prefer to take nothing at face value and to always question everything.
Ok but bear in mind life on earth would also be affected by changed universal constants. So be careful what you wish for. For example most of the energy exchange going in life is chemistry which is electrons moving between atoms and molecules using solar energy as the “kick” to store chemical energy in food which mitocondria then release via ATP.
So if you tinker with the laws of physics, it will probably instantly kill all life on earth which evolved to thrive at the current physical constants. 99% of the universe is unihabitable as we live in that narrow band of water being liquid so, while I’m sure life would evolve differently in a different universe, or this universe at a different spot in the universe, we’d likely instantly die.
So yes Wifi might work but chances are none here would notice it… but say 14B years later the next form of life would just take it for granted.
I guess my point was that the speed of light used to be the speed limit for everything in the universe until we discovered neutrinos. So everything that we know to be fact today could be proven to be totally wrong tomorrow.
It was not that long ago that people knew for a fact that the Earth was flat and that they could sail over the side into the abyss.
No, nothing moves faster than speed of light, including neutrinos. Now then neutrinos used to be considered mass-less so they moved at the speed of light but we found that some neutrinos change type which meant they must have a mass (as at speed of light time stops so if something can change it must have a mass).
Please let me know what moves faster than light, if you meant that example in Italy it was traced to the fact that gravity was different and so they ran at different time dilation (gravity changes time dilation) and didn’t violate speed of light.
The issue is everything is moving at a constant space-time, so faster you get to c the slower your time til your time stops so its a hard limit.
In the case of Wifi it would tend to go in all directions so inverse-square so you’d have to bounce it to focus in a direction (parabolic dish) but then it simply begins diffracting and if you made it lower frequency to diffract less its lower energy, if you made it higher frequency it would tend to scatter more, so very hard to make a directional energy beam. We can make a high frequency focused beam but it is hazardous to life.
Probably more likely to happen first is simply better energy storage technology, better than Lithium so you last longer between wired (or very close Wireless) charges. The upper limit of stored energy density is nowhere physics limits its more a technology at a reasonable cost limit. So I think the problem of a flat phone and don’t want a wire will get solved chemically differently.
As to flat-earth it was known by many, the Eqyptians, Greeks, for example knew the earth was a sphere. It was mostly some of the most ignorant who thought it flat, but scientists knew it wasn’t for thousands of years. The earth’s size was pretty easily accurately sized by simply trigonometry on sticks at noon between distant sticks north/south.
A little busy right now but I’ll get back to you tonight or tomorrow morning.
I’m enjoying reading this debate 
1 Like
Yes, very interesting ! From my point of few, at the moment the status is 1:1 , maybe both are right …
Keep on !