Joule Thief 101

[MileHigh]

Brad:

<<< Otherwise, I agree with the above statement.  Not only an ideal inductor is devoid of an asymptotic V/R current limit but also the current through an inductor of infinite inductance, that is somehow connected to an ideal voltage source, could never change because of the implied zero di/dt at any voltage. >>>

What's highlighted in the Verpies text above is backing up myself, Poynt, and others.  He is saying in a roundabout way that the current in an ideal coil can rise indefinitely with the presumption that he is implying that the ideal coil is connected to an ideal voltage source.

[tinman]

Brad:

<<< Quote verpies
Since an ideal inductor must have a zero resistance, this means that it must be shorted (if it ain't shorted, it ain't ideal) and it becomes physically impossible to connect any real voltage sources in series with it. >>>

I assume that the red highlighted text is what you are focusing on?





That's my understanding of what he is saying.  So from what I see you are not making any kind of point.  He is not backing you up in any way at all.

What he is saying is that if you connect a real voltage source to an ideal coil, then you introduce a resistance into the current loop and the ideal coil will lose it's inherent ideal property of no resistance with respect to the full circuit.  The current will not rise indefinitely in this case, it will be limited by the resistance of the voltage source.

Just like i said MH,you need to learn what ideal means.
An ideal voltage source has no internal resistance,as if it did,the voltage would drop when connected to the dead short verpies is talking about,and then your voltage source is no longer ideal.

On the other hand, if you connect an ideal voltage source to an ideal coil, then the current rises indefinitely.

Your coil is an inductor MH,and a large one. You have 5 Henry's of inductance--what sre you smoking tonight ?.


Brad

[MileHigh]

Brad:

I am sorry but I am going to be nasty here because you deserve it:

<<< I dont know what is going on with you MH,but you need to make up your mind here.
Can a voltage exist across an ideal inductor that has a DC current flowing through it or not?--it's a very simple question,and you can have two answers as you have above. >>>

Just because the current is flowing in one direction you are calling that "DC current?"  This ridiculous nonsense takes its root from my answering the more difficult question and you haven't mastered the concept of what "DC" means relative to talking about coils?

That is not DC current you loonie that is current that is changing in time.

All of this stupid nonsensical idiocy because poor Brad can't make a distinction between constant DC current that does not change with respect to time and current that is flowing in the same direction that does change with respect to time?

Inductors are all about current changing with respect to time and you pull off this silly stunt because you don't know?

You are in the corner with a dunce cap on right now.  People reading are aghast.

MileHigh

[MileHigh]

Have you lost your marbles MH ?
This whole thing you have been peddling is about how you can place a voltage across an ideal coil,and a DC current will flow through that coil.See below



Time..........Voltage.........Current
0...............0.................0
1...............20...............1.33
5...............500.............166.67
10.............2000............1333.33
20.............8000............10666.67
50.............50000..........166666.7

Me?--i think you have gone completely wakadoo MH.

And for the record,i stated that you said that a voltage could not exist across an ideal inductor while a DC current is flowing through it.
And yet above,you have managed to do what you said couldnt happen.

I dont know what is going on with you MH,but you need to make up your mind here.
Can a voltage exist across an ideal inductor that has a DC current flowing through it or not?--it's a very simple question,and you cant have two answers as you have above.


Brad

I am quoting this to preserve it for posterity.  Good lord love a duck.

[MileHigh]

Just like i said MH,you need to learn what ideal means.
An ideal voltage source has no internal resistance,as if it did,the voltage would drop when connected to the dead short verpies is talking about,and then your voltage source is no longer ideal.
Your coil is an inductor MH,and a large one. You have 5 Henry's of inductance--what sre you smoking tonight ?.

Brad

It's not me that has been smoking anything.  Who the hell knows what you have been up to though.  You just fell flat on your face and right now your face looks like a pancake.

I am so aghast, you never stood a chance of answering either question, ever.  You have been bluffing your whole way through this discussion and you just don't know what you are talking about, at all.