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प्रश्न
In a transformer, the frequency of A.C. voltage ______.
विकल्प
increase
decreases
remains same
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उत्तर
In a transformer, the frequency of A.C. voltage remain same.
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संबंधित प्रश्न
Which coil of a step up transformer is made thicker and why?
What type of current is transmitted from the power station?
On which type of current do transformers work?
The following diagram in Fig. 10.44 shows a coil X connected to a sensitive centre –zero galvanometer G and a coil P connected to a battery through a switch S.
(a) Describe the observation when the switch S is (i) closed suddenly, (ii) then kept closed, (iii) finally opened.
(b) Name and state the law which explains the above observations.
For what purpose are the transformers used? Can they be used with a direct current source?
The secondary windings of a transformer in which the voltage is stepped down are usually made of thicker wire than the primary. Explain why.
State the underlying principle of a transformer. How is the large scale transmission of electric energy over long distances done with the use of transformers?
State the principle of working of a transformer. Can a transformer be used to step up or step down a d.c. voltage? Justify your answer.
What is the ideal transformer?
The primary of a transformer has 40 turns and works on 100 V and 100 W. Find a number of turns in the secondary to step up the voltage to 400 V. Also calculate the current in the secondary and primary.
