Fundamental Physics/Electronics/Inductors

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Electronic component inductors.jpg
The foundation of modern electrical engineering was the discovery by Faraday that when the magnetic flux through a loop of wire was varied, a voltage was set up in the wire.

This process is called electromagnetic induction.

  • A conductor wound in the form of a coil is called an inductor (or solenoid)
  • An inductor has a strong magnetic field that has many uses
  • Inductance opposes current change
  • An inductor may have its inductance increased by:-
    • adding more turns
    • introducing an iron core through the centre of the turns


Inductor is a electric component that can store magnetic field energy


Capacitor is made from a straight line conductor of several circular turns

Inductor in DC Circuit[edit]

Magnetic Intensity Strength[edit]

Measurement of magnetic strength



Inductance has a symbol L measured in Henry unit H

For a staright line conductor

For a circular loop

For a coil of N circular loops conductor

Inductor in AC Circuit[edit]




Resistance to the AC current flow

In frequency domain

In phasor domain


Resistance to the AC current flow

In frequency domain

In phasor domain

Time Constant[edit]


Power of the capacitor

Inductor Configuration[edit]

Inductors in Series[edit]

For n inductor connected adjacent to each other as shown

The total resistance

For 2 series resistor of same value

Inductors in parallel[edit]

For n inductors connected facing each other as shown

The total inductance

For 2 parallel resistor of same value