All conductors when carrying AC are supposed to have inductance. But, when a conducting wire is given the shape of a component by winding it like a coil, it is called as inductors. An inductor is commonly known as a choke. The word choke implies the meaning ‘to check’; hence, the component used for checking the flow of AC is called a choke. The main three types of chokes are as follows:
1. Low frequency choke:
A choke designed to work in the frequency range of 50 to 60 Hz is termed as l.f. choke. It is made up to 100 henrys. It is used in the filter circuits of rectifiers for smoothing the pulsating D.C. Iron core is used in it.
2. Audio frequency choke:
A choke designed to work in the frequency range of 20 to 20,000 Hz is termed as a.f. choke it offers a high impedance to a.f. currents but very low impedance to a.f. currents but a very low impedance to D.C. it is also made up to 100 henrys. It is used in impedance coupled amplifiers for coupling and in H.T.D.C. lines for blocking the flow of a.f. currents. Iron core is used in it also.
3. Radio frequency choke:
A choke designed to work in the frequency range of 20 KHz and upwards is termed as r.f. choke. It is made to have a low inductance value of the order for micro-henrys. Commonly, its inductance value does not exceed 125 mH. It offers high impedance for r.f. currents but very low impedance for a.f. currents and D.C. it is used in impedance coupled r.f. amplifiers for coupling and in H.T.D.C. lines for blocking the flow of r.f. currents.
On the basis of core used, the types of chokes are as follows:
(a) Air core type:
It is simply a coil of fine copper wire wound on a hollow cylindrical spool of an insulating material. It is made in the inductance range of the order of micro and Milli henrys; hence, it does not require an iron core.
(b) Dust core type :
It consists of a core inside the coil. The core is made of iron dust and a suitable binding material. There are two advantages of using dust cores:
1. It has relatively high inductance value.
2. Dust core losses are less in comparison to iron cores.
(c) Variable dust core type:
In this type of coil, threaded core and spool are used so that the inductance of the coil can be varied by screwing the core. More the core is inside the coil, more is the inductance of the coil. In the coils working at high frequencies, ferrite cores are used. Ferrite is a mixture of oxides of iron, barium and strontium.
Besides above explained types of inductors, many other types of inductors are also used in electronic circuit, e.g. voice coil of headphone or loudspeaker, current coil of moving coil meter, deflection yoke coil of a T.V. receiver etc.
1. Low frequency choke:
A choke designed to work in the frequency range of 50 to 60 Hz is termed as l.f. choke. It is made up to 100 henrys. It is used in the filter circuits of rectifiers for smoothing the pulsating D.C. Iron core is used in it.
2. Audio frequency choke:
A choke designed to work in the frequency range of 20 to 20,000 Hz is termed as a.f. choke it offers a high impedance to a.f. currents but very low impedance to a.f. currents but a very low impedance to D.C. it is also made up to 100 henrys. It is used in impedance coupled amplifiers for coupling and in H.T.D.C. lines for blocking the flow of a.f. currents. Iron core is used in it also.
3. Radio frequency choke:
A choke designed to work in the frequency range of 20 KHz and upwards is termed as r.f. choke. It is made to have a low inductance value of the order for micro-henrys. Commonly, its inductance value does not exceed 125 mH. It offers high impedance for r.f. currents but very low impedance for a.f. currents and D.C. it is used in impedance coupled r.f. amplifiers for coupling and in H.T.D.C. lines for blocking the flow of r.f. currents.
On the basis of core used, the types of chokes are as follows:
(a) Air core type:
It is simply a coil of fine copper wire wound on a hollow cylindrical spool of an insulating material. It is made in the inductance range of the order of micro and Milli henrys; hence, it does not require an iron core.
(b) Dust core type :
It consists of a core inside the coil. The core is made of iron dust and a suitable binding material. There are two advantages of using dust cores:
1. It has relatively high inductance value.
2. Dust core losses are less in comparison to iron cores.
(c) Variable dust core type:
In this type of coil, threaded core and spool are used so that the inductance of the coil can be varied by screwing the core. More the core is inside the coil, more is the inductance of the coil. In the coils working at high frequencies, ferrite cores are used. Ferrite is a mixture of oxides of iron, barium and strontium.
Besides above explained types of inductors, many other types of inductors are also used in electronic circuit, e.g. voice coil of headphone or loudspeaker, current coil of moving coil meter, deflection yoke coil of a T.V. receiver etc.
Good information you shared thank you for sharing this information.
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