About transformers


Choke as an electrical engineering component

The traditional choke is usually built around the winding and the iron heart, where there is an air space. When the supply voltage is fed into the coil, the power level of the coil is also changed. In this case, the coil generates a variable magnetic flux in the iron heart. The resulting variable magnetic flux forms an electrical motor power of the opposite sequence to the rotating voltage. This electromotive force is opposed to fluctuations in the flow of the coil. The choke on the deck is the structure of the traditional ballast.

Each coil has its own self-induction coefficient , inductance (L), resulting from the structure.

The unit name of the inductance is Henry and ID H (H = Vs/A).

The value of the inductance is determined by a straight square in relation to the wire rpm and the resistance of the magnetic circuit. The resistance of a magnetic circuit is known as Rellukdance (Rm).

A toroidal choke is made by manufacturing the core from iron dust or ferritic materials.


  • switching power supply
  • mains interference filter

On the left a current-compensated inductor and on the right a differential form inductor.

Self-inductance is used in electrical engineering, but it can also be harmful.


  • an inductor levels out current fluctuation in e.g. fluorescent and discharge lamps
  • inductors are used in filter circuits and interference removal


  • an inductor causes sparks between the switch and contact tips when circuits with inductive components are disconnected

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