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प्रश्न
Draw a labeled diagram of a step-down transformer.
उत्तर
Step-down transformer
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संबंधित प्रश्न
Explain the construction and working of the transformer.
Name two factors on which the magnitude of an induced e.m.f. in the secondary coil depends.
Name the phenomenon ?
How are the e.m.f in the primary and secondary coils of a transformer related with the number of turns in these coils?
In a transformer, the frequency of A.C. voltage ______.
The output power in step-up transformer used in practice is ______.
Which among the following, is not a cause for power loss in a transformer?
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.
We need to step-up the voltage for power transmission, so that ______.
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.
The value of current in primary coil is ______.
A transformer is used ______
