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प्रश्न
For what purpose are the transformers used?
उत्तर
Alternating e.m.f. amplitudes can be adjusted with the use of transformers.
संबंधित प्रश्न
Write the function of a transformer.
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.
Mention various energy losses in transformer device
The following diagram in Fig.10.42 shows a coil of several turns of copper wire connected to a sensitive centre zero galvanometer G near a magnet NS. The coil is free to move in the direction shown in the diagram.
(i) Describe the observation if the coil is rapidly moved.
(ii) How would the observation be altered if (a) the coil has twice as many turns (b the coil was made to move three times as fast?
In a transformer, the frequency of A.C. voltage ______.
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?
Transformer works on ______.
In a transformer, number of turns in the primary coil are 140 and that in the secondary coil are 280. If current in primary coil is 4 A, then that in the secondary coil is ______.
