Inductor (Joseph Henry (1797 – 1878)
Born in upstate New York he worked on electromagnetism and inductance in Albany and Princeton. Was appointed the first Secretary of the Smithsonian Institution in Washington in 1864
- An inductor is a coil of wound on a core.
- An inductor opposes the sudden variation of current.
- an inductor stores the energy in the form of current in magnetic field.
- the coil blocks DC voltage.
- an inductor allows the Direct current
- L=µ o µr A N2/l Henry
- l=length of the core,
- µ o=permeability of free space,
- µr=relative permeability of the core material,
- A=area of cross-section of the coil, N=length of the core,
Types of Inductors:
- Fixed Inductors
- Air Core Inductors
- Iron Core Inductors
- Ferrite Core Inductors
- Variable Inductors
- Movable Core Inductors
- Tapped Inductors
Uses of Inductos
- Iron core inductor
- used in low frequency applications such as filter circuits in power supplies, chokes in fluorescent tubes or as a reactive element in ac circuits.
- Ferrite Core Inductor
- used in RF chokes for supply decoupling purpose
- switching regulated type dc power supplies
- various type of filters used in communication equipment’s
- Ferrite core variable inductor
- used in tuned circuits, it required to vary the inductance from a minimum value to a maximum value.
Application of Inductors
- chokes for supply decoupling purposes.
- switching regulated type dc power supplies.
- various type of filters used in communication equipment