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प्रश्न
Describe briefly and two energy losses, giving the reasons for their occurrence in actual transformers ?
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उत्तर
Energy losses occur in transformers:
(i) Flux leakage: Not all of the flux due to primary coil passes through the secondary due to poor design of the core or the air gaps in the core.
(ii) Eddy currents: The alternating magnetic flux induces eddy currents in the iron core and causes heating.
संबंधित प्रश्न
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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.
Which of the following statement is true?
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
In an ideal transformer, the turns ratio is `N_p/N_s = 1/2`. The ratio Vs : Vp is equal to (the symbols carry their usual meaning):
