If a current passes through a wire, the wire produces a magnetic field around it, and if we wrap the wire in a loop around a body, this field is concentrated between the loops, and any object can retain the magnetic field inside. The retention time of this field will depend on the material of the object. Experience has shown that the retention time of the field in iron is much longer than other materials and elements.
The current passes through the inductor
We want to examine the operation of the inductor in the circuit shown in the figure below. The irregularity of the nucleus atoms wants to destroy the order of the wire atoms, and this in turn reduces the current. As the current passes, the inductor nucleus gradually becomes orderly and the current reaches the maximum possible.
If we draw the voltage and current curves of the inductor, we get the following curve. The resistance of the inductor is very high and as a result all the voltage across the inductor drops (due to the irregularity of the inductor core, the current passing through it is very low (point C).
Over time, the core becomes regular and as a result, the inductor resistance decreases and Induction flow It increases and of course the inductor needs less pressure to regulate the core. Gradually all the nucleus atoms are regulated and the current in the inductor is maximized (point D) and as the core is regulated, the inductor needs less voltage.
In the inductor, the voltage flows faster than the current. In fact, the phase difference of 90 degrees in the inductor is the opposite of the phase difference in the capacitors. AC shows resistance.
In the case of inductors in AC circuits, due to the presence of the nucleus inside the inductor and the maintenance of magnetic force in the nucleus atoms, the higher the frequency, the nucleus resists the ordering of its atoms in order to maintain the magnetic force. As a result of this action, as the frequency increases, the resistance of the inductor also increases.
Inductor reaction at DC and AC voltages:
In the figure below, you can see the components of a coil (core E and I and the inductor wrapped on a pulley). For testing, a coil with 50 to 60 meters of wire is required.