iron core transformer


Most of the time, you need different AC voltage levels in the electrical system. Sometimes you need low AC voltage, and sometimes high AC voltage is your requirement. You can get both AC volts from a transformer (High and Low). You can use a step-down transformant if your system requires low AC volts from high AC volts.

High voltages can be obtained by using step-up transformers. The transformer comprises parts like the winding, core, and body. The transformer also has many types; each type depends on its core. If iron is used as a core in a transformer, it is called an iron core transformer. You will learn in detail about iron core transformers in this article. If air is present as a core in any transformer, it is called an air-core transformer.

How does a transformer work?

Transformers work by inducing electromagnetic fields according to faraday’s laws. In faraday’s laws of electromagnetic induction, the rules are defined and followed in transformer for converting one energy level to another.

It is possible to link two or more electrical circuits using the oscillating magnetic circuit created by the transformer. Mutual induction, or electromagnetic induction, is the principle behind transformer operation.

As a result of mutual induction, one coil of wire induces a voltage into another coil that is located near it. An electromagnetic transformer converts voltages or currents between levels in the electromagnetic domain. They are called transformers because they operate in the electromagnetic domain. Power is converted from the primary winding to the secondary winding using the following formula.



Np= Winding turns of the primary winding

Ns= Winding turns of the secondary winding

Vp= Primary or input voltages

Vs= Secondary or output voltages

Ip= Primary current or input current

Is= Secondary current or output current

In the transformer, only current and voltages are changed. The power of the transformer remains the same at input and output points. The frequency of its transformer remains the same and does not change.

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There are multiple types of transformers available according to their core type. The list of transformer types according to its core is mentioned below.

1.      Iron core transformer

2.      Toroidal core transformer

3.      Air core transformer

Following is the detail of the iron core transformer.

Iron core transformer

A transformer with an iron core is composed of several soft iron plates. The iron core transformer has a very high flux linkage due to its excellent magnetic properties. As a result, iron core transformers have high efficiency.

The iron core transformer consists of three parts i.e.

·        Windings (Primary and secondary)

·        Iron core

·        Connectors


Primary and secondary windings are used in the iron core transformer. The primary winding is used as input of the transformer, and secondary winding is used as output. These windings turns are raped around the core of the transformer.

Iron core

In the iron core transformer, different shapes of iron cores are used. The main shape of the core is written below.

·        E shape iron core

·        I shaped the iron core

·        L-shaped iron core

·        U shape iron core

The final iron core is formed by combining one or more iron core shapes. The iron cores are made by connecting physically thin iron sheets. A solid iron core would suffer from wasteful secondary currents (called eddy currents) if it were a conductor. Thus, the core consists of thin sheets clamped together; each sheet is insulated from the other sheet with the help of insulated material.

In the iron core transformer, the different iron cores can be arranged below.

‘E’ shape iron core + ‘I’ shape iron core = ‘EI ‘type iron core

‘E’ shape iron core + ‘E’ shape iron core = ‘EE ‘type iron core

‘U’ shape iron core + ‘U’ shape iron core = ‘UU‘ or ‘C’ type iron core

Iron core transformer applications

Transformers with iron cores are extremely useful. These transformers can transmit meager and very high power from input to output. The applications of the iron core transformer are extensive. Some applications are mentioned below.

·        Iron core transformers are used in the power supplies of the following things

o   Computer

o   Television

o   Radio

o   Amplifiers

·        Iron core transformers are also used in the following places at power plants.

·        It was common for distribution transformers to have iron cores

·        A circuit’s voltage level must be increased or decreased to ensure the correct operation of its various electrical components. Iron core transformers are used at different places.

·        A transformer with an iron core prevents DC from flowing between circuits.

·        Iron core transformers provide electrical isolation between two separate electric circuits.

·        Transmission and distribution of electricity can only occur after the voltage is raised at the electric power plant. The iron core transformer can do the job.

What are the significant advantages of an iron core transformer?

You can get many benefits by using an iron core transformer; for example, the iron core is highly inductive for electromagnetic flux and can transfer flux fifteen hundred times more than air core transformers.

·        It has more power transfer capabilities

·        Shallow magnetic flux losses. Iron core transformer loss only 2 % of magnetic flux

·        It can handle large loads, low frequencies, and high voltages.


Iron core transformers are used on a larger scale in electrical systems today. Using these types of the transformer can get maximum efficiency from any electrical system. By reading this article, you get a lot of information about iron core transformers in a straightforward way.

FAQs (Frequently asked questions)

Are transformers capable of working without iron cores?

Typically, transformer cores are made from steel, the cheapest material with high magnetic permeability. Despite the absence of a core, there will still be induction, although its flux will not be guided through the air like in a transformer so the field strength will be much lower.

Why do many transformers use iron as a core?

As a result of its high permeability, soft iron provides a complete linkage between the magnetic flux of the primary coil and that of the secondary coil in a transformer. Consequently, it is highly coercive and highly resistive.

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