MH's ideal coil and voltage question

[minnie]

   Methinks a perfect inductor has reactance without resistance. Thus the REAL component
   of its impedance would be ZERO.
   Has anyone else any trouble with this?
            John.

[verpies]

Has anyone else any trouble with this?

Not me.

[verpies]

I understand fully. But its just pretend world. Anything can be whatever one may want it to be.

Not fully because the ideal components that we've been  taking about here lately, still have restrictions placed on them even if they do not exist in reality.  Thus an ideal voltage source must have zero impedance and an ideal inductor must have zero resistance and capacitance.  So it is not anything whatever one may want it to be.

Considering ideal components unburdens the thinker from analyzing their imperfections and allows for clarity of their modeling.  Thus such components have great conceptual utility.

I think that an ideal ferromagnetic will still have the S shaped BH curve, albeit without hysteresis and coercivity.
However its permeability would be user-adjustable just like the voltage of an ideal voltage source.
What do you think?

[tinman]

Not me.

Are you saying that an ideal inductor has no impedance in reference to MHs question?.
I would think that anything that acts against a current flow,could be seen as an impedance to that current flow. Impedance is just a form of resistance -is it not?.




Brad

[poynt99]

Are you saying that an ideal inductor has no impedance in reference to MHs question?.
I would think that anything that acts against a current flow,could be seen as an impedance to that current flow. Impedance is just a form of resistance -is it not?.

Brad

verpies was responding to minnie's statement about an ideal inductor having reactance, but 0 resistance.

Reactance is the imaginary part of the impedance equation, so no, verpies is not saying that the inductor has no impedance. The impedance however in this case is purely reactive.

MH's question is a good one; what is the inductor's impedance over the first 3 seconds?

Yes, impedance is a form of resistance to current flow. That should give you a hint how to answer the above question.