Re: [TCML] Science Fair Project

[Jim Lux <jimlux@xxxxxxxxxxxxx>]

On 11/16/12 11:44 AM, w5als wrote:

> hi Jonah
>        Show them how energy can be transfer wireless by using a second
> secondary coil a few feet
> away hook to only ground.
> alton
> ________________________



Yes, but you'd need to have theory to show how much energy you expect to 
transfer, and then measure it and see if measurements are close to theory.

That's actually fairly tough to do (the theory isn't simple for near field).


You could probably hand-wave a bit on the theory, and do something like 
have your two coils at varying distances. Drive the "transmitter" with a 
signal generator at low power and measure the coupled power at the 
"receiver" as a function of distance.

Then jack up the power on the transmitter and see if the results match.


The hypothesis would be that as long as there isn't breakout and sparks, 
the low power and high power should be the same (because the field 
configurations are the same), but if you get to where there are sparks 
forming, the field is different, so the energy transfer might be less.

But it has to be quantitative.. you need to have some sort of meter on 
the "receiver" that measures something meaningful.

(And for gosh sakes, don't measure just current or voltage and call it 
"power"... I can't tell you how many projects got eliminated because an 
otherwise decent experiment in, say, solar cell output or hydroelectric 
generator output vs some variable measured open circuit voltage and 
called that "power".  )

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