Electronic circuits are integral parts of almost all the technological advances being made in our lives today. Television, Radio, Phones and Computers immediately come to mind, but electronics are also used in automobiles, kitchen appliances, medical equipment and industrial controls. At the heart of these devices are active components, or components of the circuit that electronically control electron flow, like semiconductors, Vacuum tubes etc. However, these devices can not function without much simpler, passive components that predate semiconductors by many decades. Unlike active components, passive components, such as resistors, capacitors and inductors, can't control the electron flow with electronic signals inputs.

Inductors

An inductor is a circuit element that is a wire wound into a coil to create a magnetic field. An inductor resists change in the flow of electric current through it, because it generates a magnetic field that acts to oppose the flow of current through it. When two inductors are connected in series as then their total inductance equals the sum of individual inductances. An inductor is an electrical device that transfers energy between two or more circuits through electromagnetic induction. A varying current in the transformer’s primary winding creates a varying magnetic flux in the core and a varying magnetic field impinging on the secondary winding. This varying magnetic field at the secondary induces a varying electromotive force (emf) or voltage in the secondary winding. Making use of Faraday’s Law in conjunction with high magnetic permeability core properties, transformers can thus be designed to efficiently change AC voltages from one voltage level to another within power networks.

Transformer

A transformer is an electrical device that transfers energy between two or more circuits through electromagnetic induction. A varying current in the transformer’s primary winding creates a varying magnetic flux in the core and a varying magnetic field impinging on the secondary winding. This varying magnetic field at the secondary induces a varying electromotive force (emf) or voltage in the secondary winding. Making use of Faraday’s Law in conjunction with high magnetic permeability core properties, transformers can thus be designed to efficiently change AC voltages from one voltage level to another within power networks.

The propery of the passive componenta are

b) Inductance: It is the property of a coil to resist any change in electric current flowing through it. Self inductance is caused when a coil resists the current change through itself. Mutual inductance occurs when a secondary coil opposes current change in a primary coil. Inductance is measured in Henry.