Question:
Core of a transformer is made up of:
Core of a transformer is made up of:
Updated On: Mar 5, 2024
- soft iron
- steel
- iron
- ainico
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The Correct Option is A
Solution and Explanation
Soft iron is used for making transformer cores. In these cores the material goes through complete cycles of magnetisation continuously. The material must therefore have a low hysteresis loss to have less dissipation of energy and hence a small heating of the material (otherwise the insulation of the windings may break), a high permeability (to obtain a large flux density at low field) and a high specific resistance (to reduce eddy current loses). These requirements are fulfilled by soft iron. Hence, compared to steel, iron and alnico soft iron is preferred for use as core of a transformer.
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Concepts Used:
Transformers
Transformer is a device used in power transmission to change the AC voltage without changing the frequency between the circuits. Electrical transformer consists of two coils named as the primary coil and secondary coil which is wounded on a soft iron core. The soft iron core is laminated to minimize eddy currents. Both the coil in the transformer has high mutual inductance.Transformers work on the principle of Faraday’s law of electromagnetic induction and mutual inductions.
A mutual electro-motive force is induced in the transformer from the alternating flux that is set up in the laminated core, due to the coil that is connected to a source of alternating voltage.
Other types of transformers:
- Autotransformers: This kind of transformers contain only one coil wound over a laminated core. In Autotransformers, primary and secondary windings share the same coil.
- Power transformers: They are majorly used in power generation stations as they are suitable for major higher voltages.