MH's ideal coil and voltage question

[tinman]

What is there that is beyond a voltage source and an inductor in series/parallel? I can draw it out in my head, what am I missing?

Let's throw in an ideal switch as well. What happens when the switch closes?

The second part of your question sounds like Faraday induction with the coil shorted.

I would like to ask you the question again Poynt.

1-If we have an inductor that has no resistance,and the two ends of that inductor are joined,so as the inductor is now just a continual loop of wire(shorted),can we place a voltage across that inductor that has no resistance.
2-If there is now a current flowing in that shorted ideal inductor,is there any two points across that ideal inductor where a voltage can be measured?


Brad

[picowatt]

I would like to ask you the question again Poynt.

1-If we have an inductor that has no resistance,and the two ends of that inductor are joined,so as the inductor is now just a continual loop of wire(shorted),can we place a voltage across that inductor that has no resistance.
2-If there is now a current flowing in that shorted ideal inductor,is there any two points across that ideal inductor where a voltage can be measured?


Brad

As long as the current flowing is increasing or decreasing over time, the answer to both is yes.

It is an inductor...

PW

[tinman]

As long as the current flowing is increasing or decreasing over time, the answer to both is yes.

It is an inductor...

PW

1-If we have an inductor that has no resistance,and the two ends of that inductor are joined,so as the inductor is now just a continual loop of wire(shorted),can we place a voltage across that inductor that has no resistance.
2-If there is now a current flowing in that shorted ideal inductor,is there any two points across that ideal inductor where a voltage can be measured?

As long as the current flowing is increasing or decreasing over time, the answer to both is yes.

It is an inductor...

I would like to see you do that PW.
Th inductor is a continual loop,and so the current would flow in both directions from the positive connection,to the negative.
the magnetic field produced by one half of the windings would be equal and opposite to that of the field produced by the other half of the windings. So there would be no inductive effect. Than now leaves you with only the resistance in which a voltage can be seen across,and the resistance value is 0.


Brad

[MileHigh]

I think this is an example of the root cause of one of Brad's problems:

<<< Why can a voltage not exist across a shorted ideal inductor that has current flowing through it>
Because V=IxR,and R=0  >>>

He keeps on going back to Ohm's law for an inductor.  He hears "an inductor has no resistance when DC current is flowing through it" then he says "R=0" and then he says the current must be infinity.  At least sometimes he says that.

So I don't think he can make a distinction between the special condition where an inductor manifests zero resistance and Ohm's law and zero ohmic resistance.

Assuming that I am correct perhaps someone can lead him out of that quagmire.

MileHigh

[tinman]

I think this is an example of the root cause of one of Brad's problems:

<<< Why can a voltage not exist across a shorted ideal inductor that has current flowing through it>
Because V=IxR,and R=0  >>>

He keeps on going back to Ohm's law for an inductor.  He hears "an inductor has no resistance when DC current is flowing through it" then he says "R=0" and then he says the current must be infinity.  At least sometimes he says that.

So I don't think he can make a distinction between the special condition where an inductor manifests zero resistance and Ohm's law and zero ohmic resistance.

Assuming that I am correct perhaps someone can lead him out of that quagmire.

MileHigh

The question for you MH

1-If we have an inductor that has no resistance,and the two ends of that inductor are joined,so as the inductor is now just a continual loop of wire(shorted),can we place a voltage across that inductor that has no resistance.
2-If there is now a current flowing in that shorted ideal inductor,is there any two points across that ideal inductor where a voltage can be measured?


Brad