Effects of Recirculating BEMF to Coil

[gotoluc]

For your entertainment and or correcting my understanding.

The below was posted by a YouTube user that I had been believing to be an engineer.

Posted by Drevtoobe (1 day ago)
Hey Luc, just a few pointers on measurement techniques for your consideration. For your temperature measurements, everything is relative to the ambient temperature in the room. How hot the resistors are is not about their absolute temperature, it is about their temperature difference from the ambient temperature. All of the information is in the difference temperature. That gives you a sense of how much energy is being dissipated.
One of your big resistors is elevated in the air, and the other one is on your table top. The average experimenter might noght realise that this makes a huge difference in your temperature comparisons between the two resistors. To make the comparison fairer the resistor on the table should also have been elevated in the air.

When you elevate the second resistor, then both electrical resistors with then have a comparable "thermal resistance" to the external environment.

Posted by gotoluc (1 hour ago)
I agree with what you are saying but that is not what is causing the huge differences.

Do you want me to do a video to prove to you how insignificant of a different what you are saying will do?... it will be a pleasure! others will see what a joke this HUGE difference you are imagining this will be.

Luc

Posted by Drevtoobe (6 hours ago)
Luc: Yes, the second resistor is hotter than the first resistor because the first resistor is not showing you all of the energy being supplied by the battery. Look at your schematic, when Q1 switches on, at the beggining, most of the battery energy is being stored in L1, and a smaller amount is being dissipated in R1. When Q1 switches off R1 does nothing and L1 pumps all of it's stored energy into R2, it discharges. You absolutely have to understand this to advance.

Posted by gotoluc (1 hour ago)
Drevtoobe, your arguments are becoming weak! Here are your explanations with my Yes or No replies at the end.

#1, Q1 switches on, Yes!

#2, energy is being stored in L1, Yes!

#3, a smaller amount is being dissipated in R1, No!

#4, When Q1 switches off R1 does nothing, Yes!

#5, L1 pumps all of it's stored energy into R2, Yes and more also.

#3 if all the energy that is stored in L1 is first going through R1 then that amount of energy will be affected by the Resistance of R1 and will heat the resistance of R1. You cannot bypass the energy that is FIRST going though R1 which IS THE SAME Resistance as R2 and dissipate it in R2 and say R2 is heating more because some of that same amount of energy that FIRST went through R1 was able to bypass the resistance of R1. Do you realize how absurd of an argument this is!

#5, are you also considering that when Q1 is switched off and L1 is sending back all its stored energy though R2 which is outputting more heat then R1, the first resistor that SAME AMOUNT OF ENERGY it had to go though (which you believe to be normal) but you are forgetting that some of the energy makes it through R2 and goes BACK in L1 and keeps a one pound magnet levitating! So in fact I'm not even close to dissipating all the energy in R2 that was able to mysteriously slip through R1.

Luc


To everyone: I am open to corrections if I'm not understanding correctly.

[gotoluc]

Okay, here is the new video with all the measurements hopefully

The only thing I thought of after the video is I did not show the temperature of an non heated item in the room. So I measured one and it is at 24 degrees Celsius.

Video Link: YouTube - Effect of Recirculating BEMF to Coil test 7

Luc

[Cap-Z-ro]

If his next reply is..."oops, my bad..I thot R1 was in parallel with the line", then he be no doctor.

Great work as usual Luc...I like where this is going.

Regards...

[gotoluc]

Okay, here is my last video for the day for your enjoyment purpose only

Let's not say the words please, since we may get visitors

Video Link: http://www.youtube.com/watch?v=xvE7IGCra14

Love, Peace and Light to all

Luc

[poynt99]

Luc,

Finally got this thing finished.

My response to your video #3 and #6 was getting a little long for a post so I put it in a pdf document.

I hope I have covered all that will explain what you are seeing in your circuits and why. I hope also that it will give you a better understanding of these circuits and how in general to test them and design with them.

I'm not perfect, and likely neither is the document. I hope it helps out though, that was the goal.

Feel free to ask for clarification on any part of it all. If I've confused more than enlightened, well sorry about that .

Cheers,
.99