What is Inductor?
An inductor is defined as a passive component that is used in most electrical circuits to store energy in the form of magnetic energy when electric current flows through it. It is also known as the coil, choke, or reactor. It is a two-terminal electrical component that is characterized by its inductance. Inductance is defined as the ratio of the voltage to the rate of change of current. The SI unit of inductance is Henry which is named after Joseph Henry who was an American scientist.
Applications of inductors can be seen in the following
- Tuning circuits
- Store energy in a device
- Induction motors
- Ferrite beads
- Inductors used as relays
Inductors have various uses in electrical transmissions based on their requirements.
Inductors are used in tuning circuits
With the help of inductors, the tuning circuits can select the desired frequency. The capacitors type along with the inductor are used in various electronic devices such as radio tuning circuits, a television in order to modify the frequency and help to select within multiple channels of frequency.
These are used as sensors
The inductive proximity sensors are very reliable in operation and is a contactless sensor. Inductance is the main principle behind it in which the magnetic field in the coil will oppose the flow of electric current. The proximity sensors mechanism is used in traffic lights to detect traffic density.
It is also used to store energy in a device
Inductors can store energy for a small period of time because the energy which is being stored as a magnetic field will be gone when the power supply is removed. Uses of inductors can be seen in computer circuits where power supplies can be switched.
Inductors are used in induction motors
In induction motors, the shaft in the motor will rotate due to the presence of the magnetic field produced due to alternating current. The speed of the motor can be fixed according to the frequency of the supply of power from the source. The use of inductors into the motor’s speed can be controlled.
It is used as transformers
A combination of multiple inductors with a shared magnetic field can be designed into a transformer. One of the major uses of transformer can be seen in power transmission systems. These are used in decreasing or increasing the power transmission as step down or step-up transformers.
Inductors are used as filters
Inductors when combined with capacitors will be used as filters. The input signal’s frequency while entering the circuit is limited by the use of these filters. With the increase in the frequency of supply, the inductor’s impedance increases.
Uses of inductors in chokes
As we are aware that when AC current flows through inductors, it will create a current flow in the opposite direction. This results in the inductor choking the AC current flow and passing the DC current. This mechanism is used in the power source where the AC supply is converted into DC.
It is used as ferrite beads
We have seen ferrite beads used in computer parts and in charging cables of mobile. Inductors used in ferrite beads helps in reducing the frequency of radio interface which the cable creates.
These are used as relays
Relay behaves as an electrical switch. With the use of an inductor coil in the switch, there is a magnetic field produced wherever the switch comes in contact with the flow of AC current.
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