Why Inductor block AC

 Why Inductor block AC?

An inductor does not completely block AC (alternating current) but it does oppose changes in the flow of AC current through it. This opposition to changes in current is known as inductive reactance and it is proportional to the frequency of the AC signal and the value of the inductor.

When an AC voltage is applied to an inductor, the current flowing through
it builds up gradually as the voltage changes polarity. However, as the voltage
changes direction, the magnetic field around the inductor also changes direction.
This causes a voltage to be induced in the opposite direction, which opposes
the flow of current. The inductive reactance of the inductor increases as the
frequency of the AC signal increases.

At very high frequencies, the inductive reactance of an inductor can
become so large that it effectively blocks the flow of AC current through it.
This is the principle behind the use of inductors in high-pass filters, where
they are used to allow high-frequency signals to pass while blocking
low-frequency signals.

However, it is important to note that the inductor does not completely
block the AC signal, but rather it offers a resistance to the change in current
flow, which results in a phase shift in the AC signal.


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