Wireless Electric Transmission

It is possible to transmit electrical energy without wires. It is done every day. It is being done now, as we speak.

I suppose that would translate roughly into transferring electricity, so yes.

Research abounds, if one only looks for it.

Lyn, what you mean is electro-magnetic energy.

I think the OP wanted to know if you can transfer AC/DC electricity without wires. I find that the question reveals a fundamental lack of understanding of electricity and electrical energy.

AC/ DC electricity that you use everyday to run you appliances in your home is really just energy that is transferred by the collision of electrons or other charge carriers through a conducting medium. Conducting materials are materials that have a lot charge carriers, hence are used to conduct electricity.

If you want to send "electricity" wirelessly, then presumably, I think you are saying that you would like to send it through air or through a vacuum, because we cannot speak of "electricity" if there is no medium.

In principle, it is indeed possible to send electricity through air if you have high enough voltages to induce a plasma breakdown of the air. In fact, the upper layer of the atmosphere is highly conducting. However, this is not feasible for daily use because is it is highly impractical.

In a vacuum, there are no charge carriers to transfer the electrical power. Therefore, if it is to propagate through space, you need to couple a time varying electric field with a time varying magnetic field, so that they can support each other. This leads us back to electromagnetic energy or electrical energy that lyn is referring to.

I knew an old farmer who laid out an induction coil (maybe 100' by 20') under a power line right-of-way. He had trouble with the voltage, but used it to run a water pump. His next big project was picking up roadside litter.

OK, you caught me. I never stipulated a minimum motor size or efficiency of power transmission for my comment on a motor being driven by wireless power transmission. You do deserve a GA for that. But I believe it is safe to assume that this was not a very practical configuration.

Mr. Economist, Please bear in mind that electricity and magnetism are two inseparable twins, coexistence is a must. One cannot exist without the other and therefore Mr. Lyn is correct in his response.

Dear Mr Vsar, I don't know what twins have to do with electricity. You may be interested in poetry, but here, we are discussing science. Please tell me what a permanent magnet has to do with electricity when it's stationary. And also, do tell me what the Columbic interaction between two stationary charges has has to do with magnetism. And prose will do, if infact you venture to answer.

What I meant was, Magnetism and electrical energy are like Siamese twins. they're always co-existent with one another. The OP's original quest was on how to electrical energy can be transferred without any physical link? So in free air, that transfer of energy can / is easily accomplished thru induction of magnetic field. Electricity is induced whenever the magnetic lines of force passes or cut by an electrical conductor and vice versa? I learned that in elementary school..not in any engineering school.

There you go again talking about Siamese twins without answering the question I asked you.

As engineers, we have to make a distinction between electricity and magnetism. Its time to move on from what you learned in elementary school.

I suggest you start with Maxwell's equations: 1. div(B) = 0 and 2. div(D) = rho. and think about what they really mean.

hmm if voice(voip) , video signals can be transmitted wirelessly why not current,,, look it this way the voice and video signals are pure analog signals similar to current..

I feel

voice,video = current

(analog form) (analog form)

so current transmission wirelessly can be made possible!!

Wireless transmission of electricity can be done ,provided that current is in the digital form,,

I agree with tesla's experiment,but its dangerous.

Please check out the link i gave in post#8. Witricity is here and now, as per MIT...

What is 'digital' current?

Please elaborate on this considerably further.

yes, it is possible to transmit electricity wirelessly.

It is done through Resonant Magnetic Coupling, and for this to occur we require a high frequency of the order od 100's of KHz. Reserchers at MIT are working on the same project, but till now they are able to achieve the efficiency of about 40%.

There is a Wikipedia page on this: http://en.wikipedia.org/wiki/Wireless_energy_transfer That would be a good place to discover what research is going on. Power beaming is well known. As Lyn points out, Tesla was doing this a hundred years ago. You may be able to recharge your iPhone wirelessly.

See Tesla.

Check this out : http://www.witricity.com/

MIT researchers have done some work and have started this company.

Tesla built a series of towers with metal balls on top as part of a plan to transmit power wirelessly.He did not leave plans, because he kept them all in his head.It is rumored that he planned to use the Earth's magnetic field as a carrier for the power.No one knows for sure how it would have worked, but after his death, the towers were dismantled and sold for scrap.Only one remains in the Smithsonian, (at least the ball remains).

There was much opposition to his plans,especially by Westinghouse and Edison, because at the time it would have been impossible to meter the power usage.

Strange how the towers were quickly destroyed after his demise.

I would suggest research on Tesla to try to determine what he was up to.

If you wish to pursue this venture , be careful:high voltages can be fatal.

Wardenclyffe was dismantled before Tesla's death. He left plans, hundreds of them. They are in the U.S. Patent office.

Tesla was predicting the use of the later know Schumann resonance to produce wireless energy.

Westinghouse didn't oppose Tesla, he funded him and built the Niagara Falls power station using 13 of Tesla's patents, still found on the mfr. plates to this day. JP Morgan is the one who pulled funding from Tesla for Wardenclyffe when Marconi transmitted his "S" overseas.

BTW, Marconi used 17 of Tesla's patented items to build his first wireless transmitter. Tesla's first wireless transmitter was almost ten years old at the time.

Hell, low voltage is fatal.

From what I have read, JP Morgan was not aware of Telsa's plan to build a transmitter..

Tesla had told him he was going to build a radio transmitter and he pulled the funding when he found out..

Just the opposite...JP Morgan funded Tesla with the understanding that he would be building a radio transmission site.

When Marconi performed his experiment, Tesla lost his primary funding and Wardenclyffe went into receivership and was then scrapped for the value of the lumber.

According to his biographer Tesla was never bitter towards Westinghouse nor Morgan. He understood business quite well, but was disappointed that his sponsors did not have more faith in his ultimate goal.

It's too bad, since most transmission systems for radio, television, satellite and such are either free or on a pay to access system, and not based on usage. If such a system could have been put into place in the early 1900's Tesla's ideas may have gained better traction.

What I meant was that Tesla was building an electricity transmission tower in the guise of a radio transmitter..

Yes, he was. Kind of misleading...but meeting his obligations at the same time. He went over and above the intent and missed his window of opportunity.

here somethings from MIT.

I've also see some mod stories on hacking wireless charging to personal electronics.

I'll take the liberty of speaking for myself, now.

There has been much debate and chest thumping over what was not a clear question to begin with.

Maybe it's time to wait for mohsinhamid, to add some clarity, if possible.

The quickest way I can think of to transmit "electricity" wirelessly would be lightning. It's pretty quick.