Joule Thief 101

[MileHigh]

You don't know how silly you look now Brad.  I am working online and I am trying to get you a full version of the Edward M. Purcell book in pdf form.  I hope to be able to post it soon.

[MileHigh]

Okay, so for this great public domain book the only complete version I could find was not an electronic version but a scanned-in version.

This is a 10 MB version of the book in some ".djvu" publishing format:

http://www.mediafire.com/download/l06iwa67busvq1q/Edward+M+Purcell+-+Electricity+and+Magnetism.djvu

You can add a plugin to your browser and there is probably a separate viewer program.

I found a web page to convert .djvu to .pdf:

http://djvu2pdf.com/

When you do the conversion you get a whopping 266 MB pdf file, but at least it's the whole book, 500 pages worth.

Brad, they say it's a good book, and plus you have the entire 1200 petabytes of data on the Internet, of which there are many gigabytes that will teach you basic electronics.

MileHigh

P.S.:  You know you will have achieved something when you can answer the original question correctly all by yourself.

[tinman]

You don't know how silly you look now Brad.  I am working online and I am trying to get you a full version of the Edward M. Purcell book in pdf form.  I hope to be able to post it soon.

Just use ohms law MH.
Show me a voltage that appears across an ideal coil that has a resistance value of 0 ohms,for your quotes 3 seconds.

You have an ideal voltage source and an ideal coil of 5 Henrys.  At time t=0 seconds the coil connects to the ideal voltage source. For three seconds the voltage is 4 volts.  Then for the next two seconds the voltage is zero volts. Then for two seconds the voltage is negative three volts, and then for the next six seconds the voltage is 0.5 volts.  Then after that the voltage is zero volts.

Using ohms law,please show me how you can have 4 volts over 0 ohms for 3 seconds as stated in your question. Also stated in your question,the coil/inductor is ideal,and there for has a resistance value of 0 ohms.
Thats all you have to prove MH,and the rest i will believe.

But i will tell you now,if you have an ideal voltage across a resistance value of 0 ohm's,the current will climb to infinity.
What happens then MH ?.


Brad

[MileHigh]

Brad:

It's the old cliche, you are not even in the ballpark.  Even if you could not answer the question, I was expecting that you would at least be able to formulate the beginnings of an answer to the question, and then have some traction and move forward.  But you are not even in a position to begin to formulate an answer.

So, in this day and age you are practically drowning in information, and John mentioned something that I was not even aware of so I looked it up and got you some links.

Or you can discuss it with your peers.  One of your peers would have to swallow the poison pill and tell you that you are wrong and then you can all work it out together from scratch.  I am out of that game and just dabble a tiny bit.  Or someone can do the usual spoon feeding but it's not going to be me.  I would even advise against it.  The reason is simple.  In your case it's obvious that spoon feeding doesn't work.  It's just a glorified form of copy-paste.

It would he interesting to read you guys, the people contributing right now, and other forum regulars, try to get this stuff figured out so that you truly understand it - but not have the gurus/big guns parachute in and do a spoon-feeding session.

MileHigh

[tinman]

Brad:

It's the old cliche, you are not even in the ballpark.  Even if you could not answer the question, I was expecting that you would at least be able to formulate the beginnings of an answer to the question, and then have some traction and move forward.  But you are not even in a position to begin to formulate an answer.

So, in this day and age you are practically drowning in information, and John mentioned something that I was not even aware of so I looked it up and got you some links.

Or you can discuss it with your peers.  One of your peers would have to swallow the poison pill and tell you that you are wrong and then you can all work it out together from scratch.  I am out of that game and just dabble a tiny bit.  Or someone can do the usual spoon feeding but it's not going to be me.  I would even advise against it.  The reason is simple.  In your case it's obvious that spoon feeding doesn't work.  It's just a glorified form of copy-paste.

It would he interesting to read you guys, the people contributing right now, and other forum regulars, try to get this stuff figured out so that you truly understand it - but not have the gurus/big guns parachute in and do a spoon-feeding session.

MileHigh

Using ohms law-one of the laws which you your self go by,show me 4 volts existing across a resistance value of 0 ohms.

Again,your question-->
You have an ideal voltage source and an ideal coil of 5 Henrys.  At time t=0 seconds the coil connects to the ideal voltage source. For three seconds the voltage is 4 volts.  Then for the next two seconds the voltage is zero volts. Then for two seconds the voltage is negative three volts, and then for the next six seconds the voltage is 0.5 volts.  Then after that the voltage is zero volts.

Your coil is ideal.
Every page on the internet states that an ideal coil/inductor has a resistance value of 0.
Your voltage is ideal-an ideal voltage dose not change in value over time,and when talking ideal inductors,3 seconds is an extremely long time to have a fixed voltage across it of 4 volt's.

So instead of calling me all names under the sun(as is your way when some one disagrees with you),use our simple law(ohms law),and show me 4 volts existing for 3 seconds across an inductor that has a resistance value of 0 ohms.


Brad

P.S
Yes,i would be more than happy for one of the EE guys here to comment,and back it up with proof.


Brad