Why does inductor block ac

An inductor has a higher impedance to AC than it does to DC so it will reduce the AC current but it will not reduce it to zero. The opposition by the inductor due to the inductive reactance property is proportional to the supply frequency that means if supply frequency increases the opposition also be increased.

For this reason, an inductor can totally block the very high-frequency AC. Current lags behind voltage, since inductors oppose change in current. Changing current induces an emf. This is considered an effective resistance of the inductor to AC.

Similarly, if the current through the inductor decreases, the magnetic field strength decreases, and the energy in the magnetic field decreases. For this reason, an inductor can totally block the very high-frequency AC. Now if we apply DC supply to an inductor, the inductive reactance will be zero because the frequency of DC is zero. So, as the inductive reactance is zero it will not oppose the flow of current. So the inductor passes the DC current, of course, it will offer very small resistance to the flow of current which depends upon the internal resistance of the inductor material.

Here also we will find the answer from the equation of the capacitor that is capacitive reactance. Capacitive Reactance is the property of the capacitor by virtue of which it opposes the flow of current. The equation of capacitive reactance is,. So, according to the above equation if we apply DC supply to the capacitor the capacitive reactance will be indeterminate we can say very high because the frequency of DC is zero.

So as the capacitive reactance is very high, the current cannot flow through the capacitor. Now if we apply AC supply to the capacitor, it will pass because AC has a frequency. Read Also:. Thank you for visiting the website. Reservoir capacitors are used in power supplies where they smooth the output of a full or half wave rectifier. They can also be used in charge pump circuits as the energy storage element in the generation of higher voltages than the input voltage.

So a capacitor allows no current to flow "through" it for DC voltage i. The voltage across the plates of a capacitor must also change in a continuous manner, so capacitors have the effect of "holding up" a voltage once they are charged to it, until that voltage can be discharged through a resistance. Capacitor : Its function is to store the electrical energy and give this energy again to the circuit when necessary.

In other words, it charges and discharges the electric charge stored in it. Besides this, the functions of a capacitor are as follows: It blocks the flow of DC and permits the flow of AC. Capacitor Applications. Capacitor is a basic storage device to store electrical charges and release it as it is required by the circuit. Capacitors are widely used in electronic circuits to perform variety of tasks, such as smoothing, filtering, bypassing etc…. They are used to block AC while allowing DC to pass; inductors designed for this purpose are called chokes.

They are also used in electronic filters to separate signals of different frequencies, and in combination with capacitors to make tuned circuits, used to tune radio and TV receivers.

An inductor is a passive electronic component which is capable of storing electrical energy in the form of magnetic energy.

Basically, it uses a conductor that is wound into a coil, and when electricity flows into the coil from the left to the right, this will generate a magnetic field in the clockwise direction.

Inductor is a passive element which stores the magnetic energy inside it's Magnetic field when an alternating current flows through it.

Due to absence of magnetic field, no emf is Induced. So, voltage across the inductor is zero. Hence, inductor acts as a short circuit when supplied with DC. The current through it will depend on the resistance of inductor. Inductor is designed to use on AC only.

If a high voltage DC is given to inductor , most probably it will damage it depending on the other devices in the circuit.