@Isim,


This is a PBS tutorial:

http://www.pbs.org/tesla/ins/ins_acdc.html




Through the centuries in which electricity remained a natural mystery, and later a fashionable novelty, it turned up only in the form we would term today direct current (DC), that is, with electrons moving in one direction only. The first, cumbersome batteries (called voltaic piles) and mechanical curiosities that built up static charge (like Leyden jars) provide electrons that stream in one direction. Even the famous experiments of Benjamin Franklin utilized a direct current supply—lightning.
There's certainly nothing inferior about a direct current, unless you are trying to solve practical engineering problems concerned with generating power and distributing it over great distances. A few visionaries, Tesla foremost among them, comprehended both that the new science of electricity must be, literally, transformed and that the means already existed in theory—as well as in some wheezy devices usually found in physics labs of that era. The solution lay in alternating currents (AC).

What Is Alternating Current?
An AC source produces currents that flow in one direction and then the other, continuously cycling through peak values in either direction, i.e., first positive, then negative, and so on. The advantages—which turn out to be nothing short of revolutionary—are not immediately obvious; they derive chiefly from that magnetic property of currents, induction.Direct currents don't cause much inductive action. When a switch is thrown and current first flows in a DC circuit, a magnetic field builds up. The field can induce a current to flow in any nearby wire, but only briefly, just during the few instants it takes for the current to get moving. In fact, Michael Faraday was led to his discoveries in induction by first noticing the momentary currents induced by a DC source he had turned on. Once the field is built up, induction stops; the field's force lines are stationary and no longer carrying a change of energy through space and cutting across nearby wires. With an alternating current the magnetic state of affairs is never a settled one. Each time current direction reverses, so must the pole orientation of its associated magnetic field. The entire field collapses and rebuilds in the magnetically opposite direction. If current alternates continuously, the field is never static. Alternating currents do, in a sense, copy their changes of energy into nearby circuits, making energy available there. Though all very clever, it may seem this isn't a prize winning trick; why not just connect the two circuits with a piece of wire? Why complicate matters with induction?

Transforming AC
It's not just a question of getting power to a nearby circuit; induction can be made to change the form in which power is delivered, it can be transformed, in the electrical sense. Manipulating the way fields are concentrated—usually by making coils of the conductor—will change the properties of currents and voltages that a source (the primary) induces in another, nearby set of coils (the secondary). For example, power present in the primary as a large current at a low voltage may be transformed into low current at high voltage in the secondary.

AC Advantages
Generally, engineers would much prefer to send power over long lines at a very high voltage, with comparatively lower current, but deliver it to most users at a safer, lower voltage. Transformers make that possible. Resistance in AC circuits works differently, too, so that with good design, losses in power lines are dramatically lower than in DC lines. (The first DC power stations could only serve an area within a few mile radius.)The same basic AC ideas, a magnetic transfer and transformation of power, can also make highly efficient, reliable motors. One obvious advantage, though there are many, is the spinning part, the rotor, need not be connected physically to any electrical contacts; ever changing fields in the stator (stationary part) convey the power. Nor are AC devices limited to a single AC source; several may be supplied simultaneously in a polyphase arrangement.
(http://www.pbs.org/tesla/images/blank.gif)
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@Isim,


This is a PBS tutorial:

http://www.pbs.org/tesla/ins/ins_acdc.html




Through the centuries in which electricity remained a natural mystery, and later a fashionable novelty, it turned up only in the form we would term today direct current (DC), that is, with electrons moving in one direction only. The first, cumbersome batteries (called voltaic piles) and mechanical curiosities that built up static charge (like Leyden jars) provide electrons that stream in one direction. Even the famous experiments of Benjamin Franklin utilized a direct current supply—lightning.
There's certainly nothing inferior about a direct current, unless you are trying to solve practical engineering problems concerned with generating power and distributing it over great distances. A few visionaries, Tesla foremost among them, comprehended both that the new science of electricity must be, literally, transformed and that the means already existed in theory—as well as in some wheezy devices usually found in physics labs of that era. The solution lay in alternating currents (AC).

What Is Alternating Current?
An AC source produces currents that flow in one direction and then the other, continuously cycling through peak values in either direction, i.e., first positive, then negative, and so on. The advantages—which turn out to be nothing short of revolutionary—are not immediately obvious; they derive chiefly from that magnetic property of currents, induction.Direct currents don't cause much inductive action. When a switch is thrown and current first flows in a DC circuit, a magnetic field builds up. The field can induce a current to flow in any nearby wire, but only briefly, just during the few instants it takes for the current to get moving. In fact, Michael Faraday was led to his discoveries in induction by first noticing the momentary currents induced by a DC source he had turned on. Once the field is built up, induction stops; the field's force lines are stationary and no longer carrying a change of energy through space and cutting across nearby wires. With an alternating current the magnetic state of affairs is never a settled one. Each time current direction reverses, so must the pole orientation of its associated magnetic field. The entire field collapses and rebuilds in the magnetically opposite direction. If current alternates continuously, the field is never static. Alternating currents do, in a sense, copy their changes of energy into nearby circuits, making energy available there. Though all very clever, it may seem this isn't a prize winning trick; why not just connect the two circuits with a piece of wire? Why complicate matters with induction?

Transforming AC
It's not just a question of getting power to a nearby circuit; induction can be made to change the form in which power is delivered, it can be transformed, in the electrical sense. Manipulating the way fields are concentrated—usually by making coils of the conductor—will change the properties of currents and voltages that a source (the primary) induces in another, nearby set of coils (the secondary). For example, power present in the primary as a large current at a low voltage may be transformed into low current at high voltage in the secondary.

AC Advantages
Generally, engineers would much prefer to send power over long lines at a very high voltage, with comparatively lower current, but deliver it to most users at a safer, lower voltage. Transformers make that possible. Resistance in AC circuits works differently, too, so that with good design, losses in power lines are dramatically lower than in DC lines. (The first DC power stations could only serve an area within a few mile radius.)The same basic AC ideas, a magnetic transfer and transformation of power, can also make highly efficient, reliable motors. One obvious advantage, though there are many, is the spinning part, the rotor, need not be connected physically to any electrical contacts; ever changing fields in the stator (stationary part) convey the power. Nor are AC devices limited to a single AC source; several may be supplied simultaneously in a polyphase arrangement.
(http://www.pbs.org/tesla/images/blank.gif)
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Magnetic Fields
Particles and Waves
Voltage
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Context is everything.  They are not describing any abrupt change such as occurs in a hard switching circuit.    The so-called "collapse" that they refer to follows a nice smooth sine wave.

Synchro, why are you copy-pasting all that stuff, that just shows your own ignorance? You find some quotes that misuse the word "collapse" for journalistic emphasis, and you are trying to use _that_ to tell EEs and other experienced researchers what AC is and how the magnetic field it produces behaves? Trying to tell me, with a working apparatus on my bench, that it makes inductive collapse spikes or voltage amplification by that mechanism, IN SPITE OF ALL THE EXPERIMENTAL EVIDENCE I have shown you to the contrary?

Why are you doing this? Is it because MY devices work as I say they do, in stark contrast to many other experimenters on this forum? Is it because you cannot perform experiments of your own to support your claims?

Now you've developed some kind of copy paste allergy. How'd you get that chart uploaded? You're the one with the twisted jargon. 

@synchro1:

I get the impression you fell into the Bedini/Lindemann trap, meaning there's anything special and mysterious going on, on the collapse af a magnetic field.
But as has been said and explained here, all is perfectly within expected results.
The terminology that is used by some people, what is now the "definition" of a field collapse, and now debating about it is IMHO futile.
Not the wording is the important part, but the behaviour and it's effects. And here everything is as expected.

That's right synchro, get mad and start slinging it when you can't support your argument with facts or demonstrations of your own. Garage sale equipment, cardboard crap, and all the rest: you are not the first one to accuse me of such things... but nobody has actually refuted anything I've shown, and UNLIKE the claims of the QEG heavy machined core costing thousands of dollars that fail as soon as you get decent voltage output... my systems illustrate the same resonance and OU in VARs that they have claimed AND cost much less AND are robust AND can be fully duplicated AND fully simulated by anyone with the skills and knowledge to do so. Sorry if that doesn't include you, but there it is.


Meanwhile, some people seem to be doubting this fact: Only the negative electrode of a neon actually glows. When the bulb is powered by DC, it's easy to see. When the bulb is powered by AC, it _looks_ like they both glow but in fact only the one that is negative glows, and it switches from side to side faster than you can see. If a circuit is resonating it is making AC, if the circuit is just discharging a capacitor it is DC. The Neon will tell you which, for a few pennies.

@Synchro1
(excuse me, but english is not my language...)
Thanks for the link, but I can not accept this web site as a reference text to explain physic and electricity. To make simple, after one hundred year of progress who allow you each day to use  all the gadgets and also more serious physical thing that Tesla had never dream of, you keep this as as reférence?
How these gadgets have been studied, builds? With this old reference text?
The link you provided is pointing to a popularization site dedicated to tesla works, full off words from an another time, nothing  for calculate an electric circuit, and make a forecast on his behavior. Science allow this, not this popularization text. The only interest of this text is historic about Tesla work, his think and philosphy(may be!).
You have numerous web sites to learn electricity and electronic, and more especially many book to download, from good scientific writers. And yes, they are full of equations to learn...
@+

Is someone else wanting their cut or is this a new cicu sprouting?

http://www.youtube.com/watch?v=_2cHj0CL8_I

May have to use a translator service of YOUR CHOICE  .
http://www.qegquickandeasy.com

Remember today marks the end of July dolla dolla bill girl time frame for self-running.