###### Asked in Electronics EngineeringElectrical Engineering

Electronics Engineering

Electrical Engineering

# What is the purpose of a inductor?

## Answer

###### Wiki User

###### November 26, 2008 3:23AM

An inductor tends to block the flow of alternating current, while allowing the passage of direct current. An inductor can be designed to function optimally at a particular frequency of AC, and so be used as a filter.

## Related Questions

###### Asked in Circuits

### What is inductor and its types?

###### Asked in Electronics Engineering, Electrical Engineering

### Is there no induced voltage in an inductor unless the current is changing?

In an ideal inductor, no, there is no voltage induced
across an inductor unless the current in the inductor is changing.
However, since there are no ideal inductors nor power supplies,
eventually an inductor will draw a constant current, i.e. the limit
of the power supply; and, since no inductor has zero ohms at
equilibrium, that current will translate to voltage.

###### Asked in Electronics Engineering

### May I know the properties of an inductor?

Some of them are:
1. Inductor temporarily stores energy in form of magnetic field.
It is given by E=½LI² here L is inductance & I is current.
2. Inductor causes current to lag voltage by 90°.
3. Inductor consumes reactive power.
4. Inductor oppose current change in circuit for AC only. Fo DC
it act as simple wire.
5. Inductors are used for blocking the AC while passing the DC.
They are known as chokes.
6. Inductors are used to create magnetic fields in electrical
machines for the purpose of energy conversion.

###### Asked in Physics, Mechanics

### Does inductor allow ac to pass through it?

Yes, with some difficulty. You can think of an inductor as a
kind of "AC resistor"
in a way. The higher the frequency of the AC, the more
difficulty it has passing
through the inductor.
If you apply AC voltage across an inductor, where
V = voltage of the AC
f = frequency of the AC
L = inductance of the inductor,
then the AC current through the inductor is
I = V/2 pi f L

###### Asked in Electrical Engineering

### What is working principle of inductor?

A changing current through an inductor induces a voltage
into the inductor, the direction of which always opposes the
change in that current.
So, in a d.c. circuit, an inductor will oppose (not
prevent) any rise or fall in current, although the magnitude of
that current will be determined by the resistance of that inductor,
not by its inductance.
In an a.c. circuit, because the current is continuously changing
both in magnitude and in direction, it acts to continuously
oppose the current due to its inductive reactance.
Inductive reactance is proportional to the inductance of the
inductor and the frequency of the supply. The vector sum of the
inductive reactance of the inductor and the resistance of the
inductor, is termed the impedance of the inductor. Inductive
reactance, resistance, and impedance are each measured in ohms.