Is joule thief circuit gets overunity?

[ltseung888]

Yes and no. In the first place you are not concerned with POWER, but energy. Please try to remember that. The instantaneous power curve is the intermediate step to obtaining energy flow values, and it is the energy that is important.

Thank you for the very informative answer.  I am lucky to have two Atten oscilloscopes. 
On another point, some universities have the 4 channel high end DSOs.  Will that make the measurement easier and more accurate?

[TinselKoala]

Thank you for the very informative answer.  I am lucky to have two Atten oscilloscopes. 
On another point, some universities have the 4 channel high end DSOs.  Will that make the measurement easier and more accurate?

Facepalm.
Will you please go back and read my previous posts?

There is a difference between precision and accuracy. Using the high end 4 channel scope with live math and integration will make your measurements easier and more PRECISE. Not necessarily more accurate. And in this case, accuracy is much more important than another decimal place or two of precision.

Consider the archer. She fires her arrows at a big target with a tiny red center bullseye.  She tries her best to hit the bullseye dead center (accuracy). She strives to do this with every arrow she fires with very small error (precision).

So she fires off some arrows, and all four of them are in a tight cluster, only a millimeter space between them. This is PRECISION.

But... alas, the cluster is way down and to the left of the aim point, the bullseye. This is a lack of ACCURACY.

So she adjusts the sight of her bow, she trims the fletching of her arrows and fires off four more arrows. This time they are in a looser group, they are further apart. She has lost some PRECISION.

But.... look, one of the arrows is dead center on the red bullseye and the rest are clustered just a few millimeters away. She has achieved much greater ACCURACY, even though her precision is less than before.


Which would you rather achieve, better Precision, or better Accuracy?

[plengo]

Facepalm.
Will you please go back and read my previous posts?

There is a difference between precision and accuracy. Using the high end 4 channel scope with live math and integration will make your measurements easier and more PRECISE. Not necessarily more accurate. And in this case, accuracy is much more important than another decimal place or two of precision.

Consider the archer. She fires her arrows at a big target with a tiny red center bullseye.  She tries her best to hit the bullseye dead center (accuracy). She strives to do this with every arrow she fires with very small error (precision).

So she fires off some arrows, and all four of them are in a tight cluster, only a millimeter space between them. This is PRECISION.

But... alas, the cluster is way down and to the left of the aim point, the bullseye. This is a lack of ACCURACY.

So she adjusts the sight of her bow, she trims the fletching of her arrows and fires off four more arrows. This time they are in a looser group, they are further apart. She has lost some PRECISION.

But.... look, one of the arrows is dead center on the red bullseye and the rest are clustered just a few millimeters away. She has achieved much greater ACCURACY, even though her precision is less than before.


Which would you rather achieve, better Precision, or better Accuracy?

  That was a beautiful explanation.

[Pirate88179]

TK:

Wow!  Thank you.  I have learned a lot from your last several responses here.  Well done and thanks again for this information.

Bill

[ltseung888]

Most people hope to achieve both precision and accuracy.

My eyesight is poor and my hands are shaky.  I only hope not to pour too much wine on the floor.

I would like to bring in the topic of "negative power".  This will show up lots of times in the Input and Output Power measurements.  What is your interpretation??

It looks liky that the Christmas Present to the World in 2012 is the confirmation of lead-out energy via two oscilloscopes.  Pumping out experimental data will not be a problem now.