Is joule thief circuit gets overunity?

[profitis]

@void,its time to try a different material for your core,gadolinium metal,nickel metal,cobalt metal,aluminum-nickel,manganese dioxide pressed powder/rod,titanium-nickel etc.

[poynt99]

Hi Poynt99. Sorry, but I disagree. In my many years involved in electronics I have never heard of anyone expressing input power to a circuit or system as negative Watts or negative power. Watts are Watts. It will be automatically understood that if we are talking about input power to a circuit, that this involves a power drain from the power source. Maybe, possibly at the academic level, power from power generation devices might be referred to as negative power, but in common usage involving measuring input and output power on circuits and systems, I have not encountered it.

You may disagree if you wish, but technically speaking the facts remain. The power computation in sources is negative, and the power computation in sinks is positive.

Are you familiar with Kirchhoff's Voltage Law? It states the following:

Kirchhoff's Voltage Law (KVL) (or Kirchhoff's Loop Rule) is a result of the electrostatic field being conservative. It states that the total voltage around a closed loop must be zero.

Implicit to this is a "power law" as well, and it could be stated as follows:

The total power around a closed loop or within a device must be zero.


I encourage you to draw out a simple circuit of a battery in series with 2 resistors to form a complete circuit or loop. Now go around and verify KVL. Make special note of the polarity of the drops across the resistors vs. the drop across the battery as you move around the loop in one direction. Are they the same polarity as you move around the loop? Which direction does the current flow? Is it the same direction through the battery and resistors?

If done correctly, you will find that the power in the resistors is as follows:

P = V x I = +W

and the power in the battery as follows:

P = -V x I = -W

Just because you have not encountered something, does not mean it can not exist or be correct.

[Void]

You may disagree if you wish, but technically speaking the facts remain. The power computation in sources is negative, and the power computation in sinks is positive.
Are you familiar with Kirchhoff's Voltage Law? It states the following:
Kirchhoff's Voltage Law (KVL) (or Kirchhoff's Loop Rule) is a result of the electrostatic field being conservative. It states that the total voltage around a closed loop must be zero.
Implicit to this is a "power law" as well, and it could be stated as follows:
The total power around a closed loop or within a device must be zero.
I encourage you to draw out a simple circuit of a battery in series with 2 resistors to form a complete circuit or loop. Now go around and verify KVL. Make special note of the polarity of the drops across the resistors vs. the drop across the battery as you move around the loop in one direction. Are they the same polarity as you move around the loop? Which direction does the current flow? Is it the same direction through the battery and resistors?
If done correctly, you will find that the power in the resistors is as follows:
P = V x I = +W
and the power in the battery as follows:
P = -V x I = -W
Just because you have not encountered something, does not mean it can not exist or be correct.

Poynt99, it is not a major concern to me, but I was just giving my feedback on your comments. Yes, of course I am familiar with Kirchoff's voltage law. I think we are talking about two different things here however. I am talking about the common way that input power is expressed when referring to input power measurements or input power specs on circuits. It is commonly expressed as a positive power. It is understood that input power implies a power drain from the power source. That's all I am saying. At any rate, it is not really of concern to me if someone wants to put a negative sign when expressing input power or not. As long as the measurements are done correctly, and it is made clear what various measurements represent, such as input power and output power, etc. I don't see a problem. In the case of measuring and displaying the input voltage and input current waveforms on a circuit using a scope, I think it would be confusing for people to have the input current waveform inverted (showing as a negative current) unless you include a note explaining that the current waveform is inverted from the actual. What is of main concern to me, is that measurements are done correctly. So, I would appreciate if anyone would let me know if they notice any errors in my measurements or calculations. If someone wants to invert their scope waveforms or indicate input power with a negative sign, that's fine with me as long as it is clear what they are doing.

[Void]

@void,its time to try a different material for your core,gadolinium metal,nickel metal,cobalt metal,aluminum-nickel,manganese dioxide pressed powder/rod,titanium-nickel etc.

I intend to conduct more experiments with Lawrence's boards first, but sure, it might prove interesting to investigate and try different core materials to see how it impacts circuit performance.

[profitis]

@void indeed,given the fact that of all the parts in any inductive circuitry its the core where the thermodynamics laws are supposed to be manipulated to our benefit,ie.the collapsing of magneto-alligned dipoles on each oscillatory cycle.