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Why is the core of a transformer laminated? - Physics

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प्रश्न

Why is the core of a transformer laminated?

एक पंक्ति में उत्तर

उत्तर

The core of a transformer is laminated to reduce the energy loss due to eddy currents.

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अध्याय 9: Magnetic Effect of Current - Short Answers

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आईसीएसई Physics [English] Class 10
अध्याय 9 Magnetic Effect of Current
Short Answers | Q 53

संबंधित प्रश्न

Derive an expression for ratio of e.m.f.s and currents in terms of number of turns in primary and secondary coil.


Derive an expression for e.m.f. and current in terms of turns ratio


A power transmission line feeds input power at 2200 V to a step-down transformer with its primary windings having 300 turns. Find the number of turns in the secondary to get the power output at 220 V.


What type of current is transmitted from the power station?


On which type of current do transformers work?


Explain the significance of Lenz’s law to show the conservation of energy in electromagnetic induction.


Why is the iron core of a transformer made laminated (thin sheets) instead of being in one solid piece?


State the principle of a step-up transformer. Explain, with the help of a labeled diagram, its working ?


Describe briefly, with the help of labelled diagram, working of a step-up transformer.

A step-up transformer converts a low voltage into high voltage. Does it not violate the principle of conservation of energy? Explain.


A transformer is used to step up an alternating emf of 200V to 440V. If the primary coil has 1000 turns, calculate the number of turns in the secondary coil. 


The input and output voltages of a transformer are 220 V and 44V respectively. Find the current in input circuit if the output current is 2 A.


The primary coil of a transformer has 200 turns while the secondary coil has 1000 turns. What type of transformer is this? if the input voltage is 10V, what will be the output voltage?


Find out the phase relationship between voltage and current in a pure inductive circuit.


The core of transformer is laminated to reduce ______.

Read the following paragraph and answer the question:


Long distance power transmissions

The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped up. It is then transmitted over long distances to an area sub-station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes.

A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. The number of turns in the secondary in order to get output power at 230 V are ______.


A transformer is essentially an a.c. device. It cannot work on d.c. It changes alternating voltages or currents. It does not affect the frequency of a.c. It is based on the phenomenon of mutual induction. A transformer essentially consists of two coils of insulated copper wire having different numbers of turns and wound on the same soft iron core.

The number of turns in the primary and secondary coils of an ideal transformer is 2000 and 50 respectively. The primary coil is connected to a main supply of 120 V and secondary coil is connected to a bulb of resistance 0.6 Ω.

Power in primary coil is ______.


An ideal transformer converts 220 V a.c. to 3.3 kV a.c. to transmit a power of 4.4 kW. If primary coil has 600 turns, then alternating current in secondary coil is ______.


An iron rod of 0.2 cm2 cross-sectional area is subjected to a magnetising field of 1200 Am-1. If the susceptibility of iron is 599, then the magnetic flux produced is ______.


The primary coil having NP turns of an ideal transformer is supplied with an alternating voltage VP. Obtain an expression for the voltage VS induced in its secondary coil having NS turns.


Mention two main sources of power loss in real transformers.


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