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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
Mention various energy losses in transformer device
Which coil of a step up transformer is made thicker and why?
The secondary windings of a transformer in which the voltage is stepped down are usually made of thicker wire than the primary. Explain why.
Given the input current 15 A and the input voltage of 100 V for a step-up transformer having 90% efficiency, find the output power and the voltage in the secondary if the output current is 3 A.
Mention the two characteristic properties of the material suitable for making core of a transformer.
Can a transformer be used with direct current source? Give reason.
In a series resonant RLC circuit, the voltage across 100 Ω resistor is 40 V. The resonant frequency ω is 250 rad/s. If the value of C is 4 µF, then the voltage across L 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?
Explain why core of a transformer is always laminated.
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 ______.
