I LOLed at the "Power transfer doesn't means we need to use electrical current".

I guess there is nothing more i can say until u read about P=IV

I rest my case. hva nice day.

hi, nice pic.

Seriously, u really think a transformer transform the voltages thru "AIR" ??

LOL

What's the iron core for?

Wow! Good.

So since u know that magnetic flux in the core induces the voltage on the secondary coil, then, y u ask "is there current flowing through air between the up and down steps of a coil transformer"?
A few things to clarify:

Air doesn't play a role in making this a "wireless" transfer of "power".

The iron core is important to "concentrate" the magnetic flux because air is simply inefficient. And the iron core is also made of thin layers of laminated sheet steel to eliminate eddy current (a form of transformer losses because it generates heat - 100% efficient transformer is only theoretical).

So, after all, there is current flowing in the iron core. Power loss is P = I^2 x R

Secondly, it's not called "up & down steps" of a coil transformer. It's called the primary or secondary winding of transformer. In electrical engineering, since there r "step up" & "step down" transformer, the "primary" & "secondary" don't make a good reference (ambiguous). Therefore, it's called the "LV side" & the "HV side".

Thirdly, rubber is not used as insulation for the copper wires. In the industry, PAPER ("Kraft paper") is used for large transformers (say 15MVA 132/33kV) and it is oil-impregnated when immersed in insulating oil (for cooling  & insulation purposes). For very small transformer PVC-insulated cables are used. Never rubber.

I guess SPM didnt teach u all that rite?

Thanks.

p/s: Thanks Xerone.

Hi,

1.However, quoting wat u said about "air DEFINITELY plays a role". Can u explain how does air play a role in "power transfer" in the transformer? With the characteristic of having low permeability?

2. Then, may i ask, how do u compute the amount of power transferred by the magnetic flux?

3.So, we can somehow use a device to transfer 240Vac supply from 13A socket outlet across the living room to a laptop on the table thru thin air... hmm... ya, i like it too!

4. But u have said it very well, air has low permeability. So do u still expect power to be transferred via EM wave thru thin air?

5. So, what is the next best thing available? Thru current in a conductor, can?

Thanks

Hi,
1. i do not know if human body is OK with such exposure too...

2. Maybe i can do it "pipeless" by allowing the water to evaporate and become clouds. The clouds will then drift to the village and become rain. Villagers can then collect the rain water for their daily use.

Or,

3. Maybe i can freeze the water into sizable ice cubes/balls etc. then roll it down hill for the villagers to collect and thaw into water to use.

Or,

Transport the water bucket by bucket to the village by trucks

Higher dimensional space rarely means a superspace, in most physics calculations it's a subspace i.e. a compactified dimension. If we can reach into these compactified dimensions and meddle with stuff anytime we like, I don't think our universe's physical laws will be the way they are because then, our physical constants would have been very, very different to begin with.

  How about if we condition the air so lasers, infrared & microwave can travel their designated path without much loss of energy?

Also isn't UV considered "wireless power"? They can power up calculators & those headshaking cardisplays.