Putting a lamp where there no socket

[rookies1241]

This this is a dumb question but someone was saying there is a product where you can have a lamp where there is no socket and powered wirelessly and I am said to him that a load of gobbish.

I hope I was right

 

[breezer]

you are, its here

 

[Steve]

I remember reading someone has transmitted POWER wirelessly using a certain frequency of microwaves, makes sense, but not yet developed, and besides would YOU want high powered microwaves flying about your living room?

You can, however have a lamp where there's no socket.

 

[breezer]

I wasnt sure if i heard right about the microwaves, so i said nothing, but it would seem i did hear right

 

[bernardgreen]

a lamp where there is no socket and powered wirelessly

Sounds like a bit like remote controlled battery powered torch.

 

[davelx]

There is a very old story that some people were caught tapping power from the BBC R2 Longwave transmitter (200KHz) using a tuned tank coil.

They were allegedly tracked down by plotting RF field strength contours which pinpointed their location.

It is certainly the case that old militarty field strength meters were little more than a tuned circuit and a light bulb - just tune into the tranmitter and adjust the transmitter for maximum brightness.

 

[bernardgreen]

There is a very old story that some people were caught tapping power from the BBC R2 Longwave transmitter (200KHz) using a tuned tank coil.

A very heavy copper fence wire with both ends going into a shed. Claimed to be a prototype electric fence

They were allegedly tracked down by plotting RF field strength contours which pinpointed their location.

There were reports of a strange lobe in the propgation pattern.

It is certainly the case that old militarty field strength meters were little more than a tuned circuit and a light bulb - just tune into the tranmitter and adjust the transmitter for maximum brightness.

Still in use today.

 

[TicklyT]

IIRC Nikola Tesla proposed a method for wireless power transmission back in the 19th century (along with ray guns, warp speed travel and teleportation)

 

[followgers]

In fact I spotted a news article on the telly a few weeks ago. Some chaps have developed a way of transmitting very small current wirelessly by the use of eddy currents. it is enough to chrage up his mobile phone without it being attached to this charging unit. To be quite frank, when it has to sit within 10 cm of the charger, why not just plug it in!!!

 

[bernardgreen]

To be quite frank, when it has to sit within 10 cm of the charger, why not just plug it in!!!

Explaining the benefits of wireless charging a brochure said

The plug / socket [for charging] will have to have some form of contact that will eventually wear out. Using wireless [or inductive] coupling for power will avoid failure of said plug / socket.

cynic that I am I almost believed that reason for using a high tech gizmo feature

 

[passerv]

Have a look at this

http://arxiv.org/ftp/physics/papers/0611/0611063.pdf