Inductor & Inductance

  • It provides support for its windings
  • Core provides the medium to concentrate and contain magnetic flux 

DC through coil

  • When a DC voltage is applied to the winding 
  • Due to low resistance, the winding acts as a short circuit across the terminals of the DC source 
  • Lead to the flow of heavy current through the winding resulting in overheating of the winding
  • No Magnetic flux will generate. since DC does not have zero frequency

AC through coil

  • When a AC voltage is applied to the winding 
  • Produces a self-induced emf opposing the emf that initially set up the current
  • Generate a magnetic field in the clockwise direction
  • For an ideal inductor of zero ohmic  resistance, the back emf is equal and opposite to the applied emf.
  • The induced current  generates due to a changing magnetic field.

Disadvantage of inductor

  • The inductors of high inductance value are not possible. It is in large size
  • If supply frequency increases the opposition also be increased. For this reason, an inductor can totally block the very high-frequency AC.

Induction types

  • Self Induction
  • Mutual Induction

Inductance unit

  • American physicist Joseph Henry  — henry  (unit of either self-inductance or mutual inductance)
  • One henry is the value of self-inductance in a closed circuit or coil in which one volt is produced by a variation of the inducing current of one ampere per second.

Inductor  Vs Resistors

  • Inductors are used for reducing current in AC circuits without any loss of electrical energy
  • When resistors are used, electrical energy is wasted in the form of heat

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