Why Can't We Fire Electrons Across Space For Wireless Power? - very electric toothbrush

Your understanding of the old tube
The TV model is correct!
The setup is indeed that you have a cathode, which is an electron gun that emits electrons in front of the TV.
At the front, you have a range of materials that glow in red, green or blue when they are hit by electrons, and emit electrons in the right place, you get a full color image.
One problem with using this method to provide wireless power is that the cathode is a bit large.
You must remember how bulky the old cathode ray tube display or TV is.
Compare the crt TV with the new LCD display
LCD wins both in image quality and TV size.
The LCD display is almost very thin compared to the old TV.
If you just want to power the phone up again and set up a rather delicate glass vacuum chamber, it won't be much smaller than it used to be and it's not ideal to target the phone.
Therefore, we have developed other methods for wireless transmission of power, but no cathode is used.
If you have an electric toothbrush and its charger uses one of these alternative methods, IKEA starts using the same system built into some of their coffee tables, so you can charge your phone by setting it in the right place --
No wires needed.
This method uses the current from the wall (i. e.
Mobile Electronics)
The magnetic field is induced by passing the current through the coil.
The coil inside the object to be charged can convert the magnetic field of the charger back to current to charge the device/phone/toothbrush.
The limitation here is that we have designed these objects to produce very small magnetic fields, so you need to be very close to them in order to use them.
This is good for most purposes as it mainly requires us to place the device in a specific location and is more convenient than physically inserting the device into the wall.
Of course, another problem with firing electrons in the room to charge is that firing charged particles in physical spaces where people often walk is a very bad idea.
In the other two cases, you may encounter high-speed electrons, which are in medical procedures such as radioactive decay and radiation therapy.
These electrons are usually 10 to 100 times higher than the electron energy emitted from the cathode, but the danger to human health is the combination of energy and the time you are exposed to it.
Radiation therapy is highly calibrated with the body parts they aim at and the time you spend below it, which can be a very effective treatment for certain cancers.
Radioactive decay is slightly uncontrolled, and while the human body can tolerate a high-energy dose for a while, in general, you want to minimize the amount of time spent around nuclear waste.
We have internalized this dose calculation.
If you go out, staying in direct sunlight for 10 minutes may not be enough to burn you (
Unless you look pale)
But if you stay outside for an hour, the chances of getting sunburned increase dramatically.
The energy of the UVA and UVA light we get from the sun is about 5,000 times that of the electrons emitted from the cathode, so we can guess, our cathode beam is more dangerous than sitting outside, but more dangerous than sitting next to some unstable uranium. (
If you're worried about sitting in front of the old TVdon't be;
These numbers are electrons used for cathode generation.
In TV, everything is absorbed to produce images, so there is very little radiation generated by the TV screen itself. )
The real problem is that if you put an electron gun at home, the length of time you are exposed to that electron is really hard to control.
Let's say you put it next to the table and want to charge your stuff while you're working.
How long did you spend at your desk?
Or do you charge when you sleep?
Do you put everything in a Faraday cage away from the bed, or do you usually put your phone on the table next to you?
Technically, this may be possible, but for any kind of wireless power supply, we have to make sure that these methods can be safely integrated into our home, we will not add radiation to our daily lives.
That's why the magnetic ring method is so attractive --
It does not need to emit any type of charged particles through open space, and without the receiving wire loop on the device you want to charge, there is no transmission of electricity, so, you will never shock or burn yourself on it.