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प्रश्न
What is a transformer? On what principle does it work?
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उत्तर
A transformer is device by which the amplitude of an alternating e.m.f. can be increased or decreased.
संबंधित प्रश्न
Explain why an induced current must flow in such a direction so as to oppose the change producing it.
State the principle of a transformer.
State the factors on which the frequency of the alternating e.m.f. depends.
A transformer lowers e.m.f. from 220 V to 15 V. If the number of turns in primary are 3520, how many turns are in the secondary coil?
In a transformer, the number of turns in the primary and the secondary are 410 and 1230 respectively. If the current in primary is 6A, then that in the secondary coil is
The output power in step-up transformer used in practice is ______.
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 ______.
Explain why core of a transformer is always laminated.
Which loss is reduced by laminations in the core?
What drives current through the connected load and delivers AC output?
