Is joule thief circuit gets overunity?

[Void]

Void,
Technically speaking, one of either the current or the voltage needs to be inverted when measuring input power. The input source power when measured always produces a negative (unless you have an OU device) wattage. Go around the circuit loop and notice the electric field is in opposition to all the voltage "drops" in the circuit.
Anyway, it is only a technicality, as the only difference in the end is the sign of the measured power, the magnitude will be exactly the same.

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.

If the current were really 180 degrees out of phase with the voltage, then you would have power going into the power source rather than power draining from the power source. There may be some special cases where a negative sign might be used in conjunction with power measurements, but for ordinary electronics circuits and systems power measurements, I have not encountered it. A negative sign for power might conceivably be used on a circuit or system that is over unity, and where some of that power is directed back to a battery or something similar to cause the power source to be charged more than it is drained, but I have yet to encounter such an over unity circuit or system (at least not personally) that really does produce over unity. I keep an open mind however.  Also, I don't know, but people who have systems like wind mills and solar panel power generation systems, who put some power back into the power company's power grid, may be considered as consuming 'negative power' by the power company, but I don't know if that term is actually used by the power company in that case.

[profitis]

@tk,mm interesting,perhaps its size dependant thanx.hey if you need any chemical tests done for anything let me know.

[Void]

Could you try it please?
Also try to see if you can then apply a "mean" auto-measurement of the resulting p(t) math trace.
Thanks,
.99

Ok sure, I will have a look at it and see what I can do.

[MenofFather]

Joule thief seems not have overunity.

[Void]

Joule thief seems not have overunity.

Yes, it would seem it is not very likely for an 'ordinary' joule thief circuit anyway. It is just a form of an oscillator circuit which has been used for many years in electronics. If such oscillator circuits were over unity, you would think engineers would have noticed that a long time ago. I try to keep an open mind, however. There may be special conditions where over unity could be achieved. My hobby is to experiment and keep a look out for any such special conditions.