fact ! we are all here to find a F E device and make it runing ! so... :

[z_p_e]

BEMF is simply a transformation of voltage from one level to another. The energy level is not increased.
When you apply voltage to a coil it will conduct, radiate magnetic flux and get saturated.
When the voltage is taken of the coil it strives to maintain its voltage level.
In this process it flips the voltage stored in the coil. Positive pin will become negative and vise versa.
If there is no load to take care of the reversed voltage at will shoot sky high, multiplying many times,
a lot higher than the applied voltage, but the current level of the BEMF will decrease at the same rate.

So, simply put:
The BEMF = Input Energy - Losses = Output Energy in reverse. No OU to be gained here. Period.

I know this by fact because I use the the BEMF in my daily work when designing Switched power supplies.
Recycling the BEMF of switched power supplies is the reason of them reaching those high efficiencies of 90% or more.

Mem,

I already told you this several months ago on this forum. Why are you still perpetuating this BS?

THERE IS NO OVERUNITY IN INDUCTIVE KICKBACK....PERIOD!

Folks, listen to what Honk said, because he is 100% correct.

[Evil Roy Slade]

Thankyou zpe and honk.

We know that using BEMF will not achieve the results the people here are looking for.
The problem is that the effects of BEMF can be spectacular depending on the load and how fast the inductor is switched off. And just like the night fireworks the reaction is 'OOOHHH  WAAAHH'

The conclusion then is 'There must be SOMETHING here!'

Yet another proof of:    'A little knowledge can be dangerous'

Unfortunately, it won't matter what we say. They will persist. The mind is a powerful force.

ERS

EDIT: BTW Back EMF has been understood for a long long long time.
Take your IC petrol engine for example.
The coil gets charged up, then gets switched off inducing a huge voltage across the spark plug contacts. And bang, you get a lovely little spark!

[Mem]

Mr. z-p-e
I don't pastulate formulas like you do. What I do is research and expereiments, results are  self evident.
You can choose to ignore or bs... That's your opinion, and you can do what ever you wish to do or say!

On the other hand, in the name of science and discovery new devices will continoue no matter what,
you or others may say!
As it did before you were born and shall continue so after you are gone, too...

12 car battery can't turn 15 Watt AC bulb.
If a 15 Watt AC (wire resistant) light bulb glows brightly, as soon as I turn the switch then
you know there has to be voltage and amps to make that bulb glow.

Likewise Some times I use 130 VDC 2.5 HP PM MOTOR as a load too. Normaly this motor runs slowly
with 12 V car battery. When the b emf circuit is on, this motor starts to eccelerate to a very high speed.

The difference while 130 VDC 2.5 HP PM MOTOR runs with battery v/s b emf is it can't debunk!

As the saying goes: You take the horse around the world and you show the animal all kinds of
wonders and amazing things, but horse returns home horse again!

Let he who has an ear, hear the message and to him that hear's it more shall be given...
Mem.

[nightlife]

Mem, you brought up a very good point that most don?t understand. Most are thinking that once the source is used, the source then evaporates in to the air and or leaving very little behind. That is not the case and I have tried to explain ways to some here that they should at least try out.

The biggest problem with people is that they don?t know what electricity even is. They want to produce it but yet they don?t have a clue what it is. Based on that, how in the heck can they find the most efficient way to utilize it if they don?t even know what it is. That is why I started the thread "What is electricity". We must first find out what it is and then move forward from there.

[z_p_e]

Mem,

You are seeing only what you want to see, and only what you are able to see with the eye-glasses you currently are wearing.

The problem is that evidently, you have no understanding of basic Ohm's law. You are using a 15W 110VAC bulb and a 130V DC motor as a means of certifying you have overunity, when in fact that proves absolutely nothing at all...even though you can light the bulb and turn the motor.

To understand what is happening, Ohm's law must be put into action. You can get large power output from a 12V car battery.......IF you know how. Let's use your lightbulb as an example to show you why the 12V battery does not light the bulb, but the 12V battery powering your inductive kickback circuit will.

Your 15W 110V light bulb has a resistance of about 800 Ohms. This is using the formula R=V^2/P. If you now connect this 15W bulb directly up to your 12V battery, you will only be able to dissipate 0.18 Watts in the bulb. That is 0.18 Watts ! Do you think that is enough to light the bulb? Of course it is not.

Do you know why high-end car audio amplifiers use special power supplies? The reason is because you are limited to how much power you can drive the speakers to with only a 12V supply. So what do they do to fix this problem? They generate a high voltage supply using switching power supply circuits, and will raise the supply up to about + and - 30 Volts DC. Now when driving the car speakers, they can achieve a decent power output.

It is exactly the same problem with your 15W bulb. It is meant to dissipate 15W with 110V input. You are only giving it 12V input. So now by using your inductive kickback circuit, you are creating a high voltage pulsed DC voltage which will light the bulb. Your circuit is an up-converter. Your circuit is a DC-to-DC converter. Call it what you want, the effect is there and the reason is now clear.

If you had the proper test equipment, you could measure the current from your 12V battery, and you would see that when connected directly to the bulb, there would be virtually no current there....only a mere 15 mA or so. Now connect your battery to your kickback circuit driving the lightbulb, and watch your current measurement increase to over 1 Ampere.

If you still can't see the light after this explanation, then you'll just be fooling yourself until you do. And that goes for the rest of the folks here that are buying into this falsehood.