An Inductor in an AC circuit
An ideal inductor will be lossless irrespective of the amount of current through the winding. However, typically inductors have winding resistance which are different for different wires that from the metal wire forming the coils.
Inductor in AC circuit:
An Inductor is a device which has a coil of wire wounded around a ferrite (or) iron core. The core increases the magnetic field and hence the inductance. As it can store the energy,these inductors are used as energy storage devices.
The Inductance of an Inductor in an AC circuit, is due to the the magnetic field of a conductor carrying current. This current creates magnetic flux which is proportional to the current. If there is any change in the current, it leads to the creation of voltage across the inductor, opposing the cause i.e., the change in the current. Thus the voltage dropped across an inductor is a reaction against the change in current through it.
If the instantaneous current is at its peak, then the instantaneous voltage is zero. If the instantaneous voltage is at its peak, it means that the rate of change of instantaneous current is at its maximum. Thus the voltage wave is 90° out of phase with the current wave. Thus the current lags the voltage by 90°.
The opposition to the change in current keeps changing in both magnitude and direction. This opposition to the current can be viewed as resistance that results in a phase shift between voltage and current. This resistance dissipates no power. Hence this type of inductive resistance is termed as Reactance, that is expressed in ohms.
The Inductive reactance increases as the frequency increases. In other words, if the frequency is more, then more electrons of the alternating current will be opposed by the inductive reactance.