Donate Bitcoin

Donate Paypal


PeakOil is You

PeakOil is You

Wireless electricity (MIT's successful experiment)

What's on your mind?
General interest discussions, not necessarily related to depletion.

Re: Wireless electricity (MIT's successful experiment)

Unread postby coyote » Mon 11 Jun 2007, 22:39:03

Thanks for the thoughtful posts, gg3. You've certainly clarified this issue.

Here's a rather humorous blog post relating to the little side discussion:

Cellphone cooks egg

Silly as hell, but you know I've got to try it now.... :-D
Lord, here comes the flood
We'll say goodbye to flesh and blood
If again the seas are silent in any still alive
It'll be those who gave their island to survive...
User avatar
coyote
News Editor
News Editor
 
Posts: 1979
Joined: Sun 23 Oct 2005, 03:00:00
Location: East of Eden

Re: Wireless electricity (MIT's successful experiment)

Unread postby kolm » Tue 12 Jun 2007, 03:56:52

$this->bbcode_second_pass_quote('Judgie', 'O')k, let's all get back on track.

Being able to have our mobile phones and laptops post-peak is all good if we have the generation capacity in place. The real concern though is, can this system be used to power transportation systems as they are today, or is it only good for small scale applications?


From a first glance: The first question is how the efficiency behaves if you scale the transmission distance up. Although you create a three-dimensional field, in an ideal world only the designed recipient would 'suck' out energy from your device; the transmission losses will come from imperfection of the world, i.e., other energy leeches. On a lab scale, air would not allow for many such leeches, but thinking of hundreds of meters.. Well, if you drive a car through a strong, alternating magnetic field, from what I know this induces electric current. This might or might not be of concern for the driver, but surely will affect efficiency negatively. The amount of possible energy leakages, roughly speaking, will grow at the very least with the square of distance, if not with the cube (I have no idea how much you would lose to accelerating/heating ions and the like).

The second question is about public safety and acceptance, the third about cost and maintenance. However, I do have the feeling that the idea falls flat at the first hurdle already. (And, I might add, the guys at MIT surely know this, but they are clever enough to know their great success will be covered by the mainstream media, but nobody will knock their door in three years and demand answers why nothing panned out.)

And finally, why would anyone want to replace the transition technology? IMHO, it is pretty good, albeit its usage (logistics etc) might be suboptimal in some places. And certainly, it is not the main problem re energy issues.
User avatar
kolm
Peat
Peat
 
Posts: 80
Joined: Thu 11 May 2006, 03:00:00

Re: Wireless electricity (MIT's successful experiment)

Unread postby steam_cannon » Tue 12 Jun 2007, 16:01:09

$this->bbcode_second_pass_quote('coyote', 'T')hanks for the thoughtful posts, gg3. You've certainly clarified this issue.

Here's a rather humorous blog post relating to the little side discussion:

Cellphone cooks egg

Silly as hell, but you know I've got to try it now.... :-D
You can try it but it's just a hoax and will not work... :roll:

$this->bbcode_second_pass_quote('joewein.net', '
')Hoaxes and Urban Legends: You can cook an egg by placing it between two cellphones
http://www.joewein.net/hoax/hoax-cook-e ... lphone.htm

A cell phone battery doesn't actually carry enough charge to heat an egg to the required temperature.

Skip the following figures if you don't care for physics:
A fairly average 3.6V mobile phone battery stores 730 mAh, which is 2,6 Wh (Watt hours) of electric energy. This is 1.7 kcal or enough to warm a 60g egg by 28 degrees Celsius (50 Fahrenheit). In other words, if all the energy used by the cell phone was converted into microwave energy (a lot of the electricity warms the silicon in the electronics and the display and thus just warms the handset) and all that energy were to radiate *only* at the egg and in no other direction, the egg would barely reach body temperature before the battery goes dead. In practice only a fraction of the energy would turn into microwave radiation that warms the egg. The numbers simply don't add up. Given the known specification of mobile phone batteries and the laws of physics it's doubtful if even dozends of mobile phones piled around it were capable of boiling an egg.


Here's a fun amusing experiment that actually does work.

Candle in the microwave
http://www.youtube.com/watch?v=27TDCXpBn2g

Microwave candle plasma in a jar
http://www.youtube.com/watch?v=s7ireaqFVqo
User avatar
steam_cannon
Expert
Expert
 
Posts: 2859
Joined: Thu 28 Dec 2006, 04:00:00
Location: MA

Re: Wireless electricity (MIT's successful experiment)

Unread postby coyote » Tue 12 Jun 2007, 19:06:09

Ah, I wouldn't have gotten around to it anyway. 8)
Lord, here comes the flood
We'll say goodbye to flesh and blood
If again the seas are silent in any still alive
It'll be those who gave their island to survive...
User avatar
coyote
News Editor
News Editor
 
Posts: 1979
Joined: Sun 23 Oct 2005, 03:00:00
Location: East of Eden

Wireless Electricity

Unread postby jasonraymondson » Fri 06 Jul 2007, 11:40:32

{thread merged by emersonbiggins - a simple search for "wireless electricity" would have resulted in this thread}

MIT has figured out how power object through electromagnetic wireless energy.

http://www.boston.com/business/technolo ... out_wires/

Imagine, cars that run not on gas, but on electricty sent through the air.
jasonraymondson
Permanently Banned
 
Posts: 2727
Joined: Wed 04 Jul 2007, 03:00:00
Location: Peace Out

Re: Wireless electricity (MIT's successful experiment)

Unread postby asdar » Fri 06 Jul 2007, 12:17:52

This is a new way. They know that wireless transmission of power has been done before, they mentioned Tesla and transformers in their own report. It's used in transformers across the country.

What they've done that's slightly different is to improve resonate coupling. Resonate coupling transmits at a certain frequency eliminating a lot of the waste. They've increased the distance, and the efficiency.

At this point I don't care about health risks, it doesn't even enter into the realm of scientific research so why bother before they try to apply this tech to the real world. Anyone producing products is held to the same liability, so they'd be stupid not to test for safety.

Efficiency of course matters, but there is energy to be had, if we're willing to go the extra mile to get it. The least important use of this in my opinion is powering cell phones and laptops. That's just convenience.
User avatar
asdar
Wood
Wood
 
Posts: 37
Joined: Fri 06 Oct 2006, 03:00:00

Re: Wireless electricity (MIT's successful experiment)

Unread postby kublikhan » Wed 11 Mar 2009, 18:51:46

$this->bbcode_second_pass_quote('gg3', 'A')ll the folks in this thread who are in favor of this technology have just placed their hands in a monkey trap.
Did you notice the part where MIT said that the energy transfer is presently 60% efficient, and could be raised to 80% efficient?
Translation: At present, 40% of the energy is wasted, and at best, 20% of the energy would be wasted.
Further translation: Just when we need to reduce energy consumption, along comes a technology that would increase energy consumption by 20% to 40% for the devices it powers. And if you want to limit it to low-power devices, all you're doing is creating the latest class of "energy vampires," exactly akin to those little wall-wart transformers that, in another topic, folks here discovered (with the aid of their Kill-A-Watt meters) were sucking down electricity in their homes to a degree they had never thought possible.
Further translation: Once again, the false god of convenience has trumped common sense.
F---ing shameful if you ask me, or even if you don't.
I think you are being a bit harsh here. Obviously a wired solution would be the most energy effecient. But there are legitimate applications where wired solutions are not practical, and batteries are a less than ideal solution. If you could free yourself from the power and cost limitations of batteries, and at the same time save some weight on your device, at the cost of only 20% greater energy use, that does not sound like such a bad thing to me.
The oil barrel is half-full.
User avatar
kublikhan
Master Prognosticator
Master Prognosticator
 
Posts: 5064
Joined: Tue 06 Nov 2007, 04:00:00
Location: Illinois

Re: Wireless electricity (MIT's successful experiment)

Unread postby outcast » Wed 11 Mar 2009, 22:02:13

NECROTHREADAGE!!!!!!!!!!!!!!!!
Y2K is real. Y2K is going to rock our world.
-Kunstler

Don't respond, I'll just ignore it.
-MonteQuest
User avatar
outcast
Tar Sands
Tar Sands
 
Posts: 885
Joined: Mon 21 Apr 2008, 03:00:00

Re: Wireless electricity (MIT's successful experiment)

Unread postby jasonraymondson » Thu 12 Mar 2009, 00:24:20

$this->bbcode_second_pass_quote('kublikhan', '')$this->bbcode_second_pass_quote('gg3', 'A')ll the folks in this thread who are in favor of this technology have just placed their hands in a monkey trap.
Did you notice the part where MIT said that the energy transfer is presently 60% efficient, and could be raised to 80% efficient?
Translation: At present, 40% of the energy is wasted, and at best, 20% of the energy would be wasted.
Further translation: Just when we need to reduce energy consumption, along comes a technology that would increase energy consumption by 20% to 40% for the devices it powers. And if you want to limit it to low-power devices, all you're doing is creating the latest class of "energy vampires," exactly akin to those little wall-wart transformers that, in another topic, folks here discovered (with the aid of their Kill-A-Watt meters) were sucking down electricity in their homes to a degree they had never thought possible.
Further translation: Once again, the false god of convenience has trumped common sense.
F---ing shameful if you ask me, or even if you don't.
I think you are being a bit harsh here. Obviously a wired solution would be the most energy effecient. But there are legitimate applications where wired solutions are not practical, and batteries are a less than ideal solution. If you could free yourself from the power and cost limitations of batteries, and at the same time save some weight on your device, at the cost of only 20% greater energy use, that does not sound like such a bad thing to me.



WHAT THE HELL ARE YOU DOING?

This thread has been dead for two years. WTF
jasonraymondson
Permanently Banned
 
Posts: 2727
Joined: Wed 04 Jul 2007, 03:00:00
Location: Peace Out
Top

Re: Wireless electricity (MIT's successful experiment)

Unread postby kublikhan » Thu 12 Mar 2009, 14:25:33

$this->bbcode_second_pass_quote('jasonraymondson', 'W')HAT THE HELL ARE YOU DOING? This thread has been dead for two years. WTF
I am confused myself. I don't seem to remember searching old threads yesterday and though I was replying to a thread at the top of the forum. Was this thread merged with a more recent thread? At any rate, I abash myself for failing to look at the date of the comment.
The oil barrel is half-full.
User avatar
kublikhan
Master Prognosticator
Master Prognosticator
 
Posts: 5064
Joined: Tue 06 Nov 2007, 04:00:00
Location: Illinois
Top

Previous

Return to Open Topic Discussion

Who is online

Users browsing this forum: No registered users and 3 guests

cron