Electronic Devices – Inductor

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 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,


Electronic Devices – Capacitor


A capacitor consists of two conducting plates separated by an insulating medium. The capacitor can store electric charges, in the form of voltage in electric field. The capacitor blocks direct current. The capacitor opposes any sudden change of voltage applied to it. Capacitor only allows the Alternating current. Capacitor makes the time delay

C=Ԑ o Ԑr A / d farad A=area of each plate in m2,

  • d=distance between the plates in meter, Ԑr =relative dielectric constant(permittivity).
  • Ԑ o=dielectric constant(permittivity)of free space,


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