Question on remote power harnessing?

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In summary, a radio station can wirelessly power a 60 watt light bulb. However, this is inefficient and has many practical inconveniences.
  • #1
DontPanic
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This might sound like a question on pseudo-science but has there been any study done on the possibility of harnessing energy from a wireless remote power source? In other words, a machine drawing power from a generator without means of wires, pipes…ect. Of course, solar power comes to mind but this is not quite what I mean. What I mean is, a generator emits energy and a machine harnesses and is powered by means of simply being within a certain radius of the generator. Is this something that is physically possible in theory or is this simply science fiction?
 
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  • #2
It is possible and it is done, but not exactly in the way that you envision. Radio stations do this, and they are the closest to what you describe. Electric toothbrushes do it too, but at a range of a few milimeters. But transmitting power omnidirectionally is extremely inefficient, so the idea doesn't hold a lot of promise for the application you describe.
 
  • #3
How do you think a radio works? It draws a very small amount of energy from the field radiated by a radio station. The difficulty is that the radio station radiates Megawatts and your radio receives milliwatts. This same principle applies in general to all radiated power. It can be done but only with large losses.

You can beam energy will lower losses but there then the receiver and transmitter must be in line of sight and maintain a fixed relationship, ie the transmitter and receiver must be pointing at each other. Then, if the energy density is high, you must be careful not to interrupt the beam with living creatures.
 
  • #4
Induction is an example of wireless power transfer. The primary/secondary windings are example s of this. This can be used for near field power transfer. See http://www.discovercircuits.com/forum/showflat.php?Cat=0&Number=6040&an=0&page=0#Post6040 homemade circuit.

Using lasers is also an interesting thought. But one has to question the efficiency when using this method. This requires a direct line of sight with the source of the laser and the solar cell receiver. May be somewhat useful for low power devices.

But the key here is efficiency
 
  • #5
Witricity.

The MIT researchers successfully demonstrated the ability to power a 60 watt light bulb wirelessly, using two 5-turn copper coils of 60 cm (24 in) diameter, that were 2 m (7 ft) away, at roughly 45% efficiency.[3] The coils were designed to resonate together at 9.9 MHz and were oriented along the same axis. One was connected inductively to a power source, and the other one to a bulb. The setup powered the bulb on, even when the direct line of sight was blocked using a wooden panel.
 
  • #6
The wireless transmission of energy is certainly not new, but has significant concerns.
Omnidirectional transmission is the most "accessible" but also the most wasteful.
Unidirectional transmission is the opposite.
 
  • #7
I think to answer the meat of this question, it should be stated that we do know how to transmit power wirelessly purely for the sake of transfering power (as opposed to the fact that radios incidentally transmit power but it's purpose is to transmit music/news). We could, for example, transmit power from solar arrays in Earth's orbit down to receivers on the ground... except why should we? Transmitting electricity wirelessly is inefficient and there are plenty of practical inconveniences. The real problem is that it's a solution where there is rarely a problem! We transmit electricity over electrical lines from say, a solar panel field at what... 95% efficiency at a very very low price! FAR lower then putting a satellite in orbit with panels just to get that bit more power/area.

Short answer, yes, easily doable. The problem is there's no reason to. Infact, we had an article in a thread up a few weeks ago where Nokia thinks there's enough energy flying around us from radio stations and what not that they can harness it to charge cell phones wirelessly!
 

FAQ: Question on remote power harnessing?

What is remote power harnessing?

Remote power harnessing refers to the process of capturing and utilizing energy from a distance, typically using technology such as wireless transmission or remote sensors.

How does remote power harnessing work?

The specific method of remote power harnessing depends on the technology being used, but generally it involves capturing energy from a remote source and transmitting it to a device or system that can use it. This can include processes such as converting solar energy into electricity or using radio waves to transfer energy wirelessly.

What are the benefits of remote power harnessing?

Remote power harnessing offers several potential benefits, including reducing the need for physical infrastructure (such as power lines), increasing energy efficiency, and providing access to energy in remote or hard-to-reach locations.

What are the challenges of remote power harnessing?

Some of the challenges of remote power harnessing include the need for advanced technology, potential interference or limitations from physical barriers, and the ability to store and distribute the harnessed energy effectively.

How is remote power harnessing being used in real-world applications?

Remote power harnessing is currently being used in a variety of applications, such as powering remote sensors, providing electricity to off-grid communities, and transferring energy to remote locations for industrial or military purposes. Ongoing research and development is also exploring new ways to utilize this technology in areas such as transportation and agriculture.

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