Partnered Output Coils - Free Energy

[MileHigh]

Now... here is something to think about. What happens if you have some energy stored in the magnetic field of a large inductance... and then you suddenly reduce that inductance to less than 1/10 its former value? Where does the energy go?

What if you do this over and over with some electronic switching magic?

The current will instantly jump up in amps.  The classic example I use is the spinning figure skater.  However perhaps a lot of people have trouble with the good old electrical-physical analogies.  Of course we saw the effect with the shameless queasy Qweegie.

But a nice little experiment cold be done with a big coil with a bypass switch that simply shorts out half the turns in the coil.  It would be somewhat tricky to set up but to ignore all the details and cut to the chase something like this:

You have a coil discharging one amp through a one-ohm resistor.  You close the switch and the current instantly jumps up to four amps.  So your DSO simply triggers (one-shot scope capture) on when the voltage across the resistor hits three volts, rising edge.

[Cap-Z-ro]

it is not a phallic symbol
it is a christmas tree

Who's kidding who here ?

Another arse kisser arrives with a bag of semantics.


Regards...

[MileHigh]

TK:

I have to add to my example because I realize that there was a mistake.  You would need a fancier "make before break" switch.  When the switch first engages you short out 1/2 of the coil and effectively bypass it in the circuit, the "make."   Then a few tens of milliseconds later you have to open-circuit the now-bypassed second half of the coil, the "break."

Certainly when the break happens there is going to be some arcing across the switch contacts.  So I am going to assume that the current in the main loop of the circuit will increase, but it won't jump from one amp to four amps.  It will jump up, but by how much I am not sure.  It all depends on how much arcing there is when you have the "break."

Now if I had a bench setup I might be curios enough to set it up and follow the energy trail.

Even for the spinning figure skater it is not that simple and it ties into NoBull's comments about the requirement to expend energy to change the properties/shape of the coil.  When the spinning figure skater pulls her arms in to speed up her rotation, it takes work to do that.  So does that mean that she speeds up to an even higher speed as compared to if he arms "magically" instantly changed position?  I say yes because of COE.  She uses some of her own chemical energy to pull her arms in, resulting in increased rotational speed.

MileHigh

[NoBull]

But a nice little experiment cold be done with a big coil with a bypass switch that simply shorts out half the turns in the coil.  It would be somewhat tricky to set up but to ignore all the details and cut to the chase something like this:

You have a coil discharging one amp through a one-ohm resistor.  You close the switch and the current instantly jumps up to four amps.

...and why would you write this?
Doesn't the shorted half maintain flux so the other half does not have to?

[MileHigh]

...and why would you write this?
Doesn't the shorted half maintain flux so the other half does not have to?

Exactly.  I realized I made a mistake.  That's why I made posting #528.