Electricity is already sent wirelessly in electric toothbrushes and kettles. Now the power must be sent over greater distances so that your computer and TV can also avoid cables. In this article, we are looking closer at how wireless electricity works and what it is.
Even now, electricity can be sent wirelessly, but only over short distances. This happens, for example, in electric toothbrushes, where a copper coil in the charger converts electricity into a magnetic field.
The magnetic field is captured by a copper coil in the toothbrush, whereupon the field is converted into electricity again.
The problem is that the energy is lost if the distance between the coils is too large.
Electricity moves wirelessly through the air
However, a new way of using the technology means that the energy can be sent over greater distances without being lost.
The secret is to make the coils in the system resonate so that the magnetic fields pulsate at the same rate. In this way, the energy is conserved.
In the future, a coil can be built into your TV and the power can be sent wirelessly from a coil in the wall that is connected to the mains.
Is wireless electricity dangerous to humans?
According to the researchers, you do not have to be afraid of getting a shock from wireless electricity. The magnetic field between the copper coils can pass through most materials and is about as weak as the earth’s own magnetic field.
Wireless electricity. It sounds impossible, but the technology is actually already here. Companies and researchers have come a long way, but the projects are surrounded by hush-hush and secrecy.
Imagine never having to plug a cord into an electrical outlet and avoid tripping over your computer cable forever. Such a technical solution would undoubtedly renew the concept of wireless.
In recent years, wireless electricity and technology have spread like wildfire and established itself in more and more product groups – today it is in many cases a matter, of course, to connect the mobile phone to the computer or a headset via Bluetooth, to connect the printer to the computer via wlan network or to stream music from the computer to a music system.
In a few years, wireless information transmission has established itself as constantly changing. But until recently, there has never been talk of a cordless transfer of energy other than in research circles.
Tesla was the first with the idea.
Does all this sound familiar in any way? Then it may be because you have read about it before.
The ingenious researcher Nikola Tesla discovered and confirmed over a hundred years ago that it is possible to transport energy through the air – but even today, neither research nor high-tech companies have been able to launch a pure technology that makes it possible to charge electronic products without some contact.
The usual rechargeable electric toothbrush – which tons of people have at home – is, however, a step in the right direction because it often uses so-called electromagnetic induction instead of input and output current contact (the object is placed on/at the charging source).
Even cunning Americans with property near high-voltage power lines have learned to “drop” power lines on energy.
They do this by placing copper cable near the high-voltage lines.
At the end of last year, researchers at MIT (Massachusetts Institute of Technology) presented theories and technology for how it is possible to charge batteries wirelessly. Batteries that could sit in mp3 players, laptops and cameras.
The answer to the researchers’ question was resonance – a phenomenon that causes an object to vibrate at a certain frequency. Which frequency depends on the properties of the object.
Two objects that have the same resonant frequency tend to pair very strongly – Similar to musical instruments.
To understand how it works, you can imagine two similar musical instruments that are close together. When one instrument plays a certain tone, it “infects” the other nearby instrument, which apparently begins to vibrate at the same frequency.
But in this case it is not about sound, but about electromagnetic waves (infrared, radio, and X-ray waves). The problem, however, is that the energy from such transmitters spreads uncontrollably with large “waste” – which has led MIT researchers to focus on so-called non-radiating antennas with what is called long-lasting resonance. As such, the energy remains in the antenna until an object with the same electromagnetic resonance is nearby. Then the energy can be transferred to the other antenna.
Plate for cordless charging
But the solution has been going on for a long time. Because despite the fact that MIT researchers only now consider themselves to have solved the secret behind cordless energy transfer, there has been a number of companies that have worked on this technology.