Electron wrote:
> trying to improve my knowledge of inductors.

Then Google and find a tutorial first.  Surely there must be many basic
introduction to inductors out there.  Do your homework first, then ask here
about remaining issues.

> The energy stored in an inductor is proportional to the current that
> is flowing through it in that certain moment.

No.  Go look it up.

> If the current
> increases, then (part of it or all?)

All unless you hit saturation.

> gets stored as additional energy
> in the magnetic field,

> I'd three questions for Your brains:

Phew.  Good thing they are not for my foot or left elbow.  Those aren't very
good at answering questions.

> 2) Suppose I increase the current in an inductor till 1A, then keep
>    it constant for 1 second. What happens during this second? Do I
> simply waste power?

In a ideal inductor, no.  However, most (all you can hold in your hand)
inductors have a non-zero resistance.  During the 1 second of constant
current this resistance will dissipate power.

> 3) If I simply wasted power (continuing from the previous question),
>    then I suppose I will waste some power even during the "current is
>    increasing" part. Then, when current is increasing (that is, dI/dt
>    is not zero), how much energy I am storing and how much I wasting
> (as heat, etc..)? What is the formula?

Model the real inductor as a ideal inductor in series with a resistor and it
will become obvious.

> I fail to make an analogy with capacitors, as once charged they get
> (theoretically) infinite impedance.

Huh?  Go read a tutorial on capacitors too.

> Inductors instead get
> (theoretical) zero impedance, and this may imply the "waste" problem
> stated above. As I said, I fail to make an analogy with capacitors on
> this particular issue.

This is too confused to try to correct here.  Go read some introductory
material on inductors and capacitors and then come back after having done
your homework.


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