What is a Transformer? State its operating principle and explain any three major energy losses that occur in a real transformer, along with methods to minimize them.

Q: What is a Transformer? State its operating principle and explain any three major energy losses that occur in a real transformer, along with methods to minimize them.

Transformer:\nA transformer is a static electrical device used to step up (increase) or step down (decrease) alternating voltage without altering the frequency of the power supply. Operating Principle:\nIt works on the principle of Mutual Induction. When alternating current flows through the primary coil, it creates a continuously changing magnetic flux in the core, which links with the secondary coil and induces an alternating electromotive force (emf) in it. Energy Losses and Remedies: Copper Loss (Joule Heating): Energy is lost as heat due to the resistance of the primary and secondary copper windings ($I^2R$ loss). Minimization: Thick copper wires with low resistance are used for high-current windings. Eddy Current Loss: Changing magnetic flux induces eddy currents in the iron core, causing heating. Minimization: The core is made of thin, insulated, laminated iron sheets instead of a solid block. Hysteresis Loss: Repeated magnetization and demagnetization of the core material during each AC cycle generates heat. Minimization: The core is made of soft iron or silicon steel, which has a narrow hysteresis loop (low coercivity).

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Accepted Answer

Transformer:
A transformer is a static electrical device used to step up (increase) or step down (decrease) alternating voltage without altering the frequency of the power supply. Operating Principle:
It works on the principle of Mutual Induction. When alternating current flows through the primary coil, it creates a continuously changing magnetic flux in the core, which links with the secondary coil and induces an alternating electromotive force (emf) in it. Energy Losses and Remedies: Copper Loss (Joule Heating): Energy is lost as heat due to the resistance of the primary and secondary copper windings ($I^2R$ loss). Minimization: Thick copper wires with low resistance are used for high-current windings. Eddy Current Loss: Changing magnetic flux induces eddy currents in the iron core, causing heating. Minimization: The core is made of thin, insulated, laminated iron sheets instead of a solid block. Hysteresis Loss: Repeated magnetization and demagnetization of the core material during each AC cycle generates heat. Minimization: The core is made of soft iron or silicon steel, which has a narrow hysteresis loop (low coercivity).

CBSE · Class 12 · Physics · Alternating CurrentWhat is a Transformer? State its operating principle and explain any three major energy losses that occur in a real transformer, along with methods to minimize them.