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प्रश्न
For what purpose are the transformers used? Can they be used with a direct current source?
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उत्तर
The purpose of the transformer is to step up or step down the a.c. voltage.
No, a transformer cannot be used with a direct current source.
संबंधित प्रश्न
The input and output voltage of a transformer are 220 V and 44 V respectively. Find: the turns ratio.
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.
In an ideal transformer, an output of 66 kV is required when an input voltage of 220 V is available. If the primary has 300 turns, how many turns should the secondary have?
State the factors on which the frequency of the alternating e.m.f. depends.
Name the principle on which functioning of a transformer depends.
Find out the phase relationship between voltage and current in a pure inductive circuit.
The output power in step-up transformer used in practice is ______.
An iron rod is placed parallel to magnetic field of intensity 2000 Am-1. The magnetic flux through the rod is 6 × 10−4 Wb and its cross-sectional area is 3 cm2. The magnetic permeability of the rod in Wb A-1m-1 is ______.
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?
