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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
For what purpose are the transformers used? Can they be used with a direct current source?
What is the function of a transformer in an a.c. circuit? How do the input and output powers in a transformer compare?
The primary coil of a transformed has 800 urns and the secondary coil has 8 turns. It is connected to a 220 V a.c. supply. What will be the output voltage?
Distinguish between Step up and Step Down Transformer.
A step-down transformer connected to the main supply of 220 V is used to operate 11V,88W lamp. Calculate
- Voltage transformation ratio and
- Current in the primary
A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the ratio of output to input power is 0.8, then the current drawn by primary winding 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?
An ideal transformer converts 170 V a.c. to 1.70 KV a.c. to transmit a power of 3.4 KW. If primary coil has 500 turns then alternating current in secondary coil is ______.
