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प्रश्न
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?
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उत्तर
`E_p = 220 V `
`E_p = 66 kV = 66 xx 10^3 V`
`N_p = 300 (E_p)/(E_s) = (N_p)/(N_s)`
Ns = Number of turn in secondary
⇒ `220/(66xx10^3) = 300/(N_s)` ⇒ Ns = 90000 turns
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संबंधित प्रश्न
Explain the construction and working of the transformer.
A group of students while coming from the school noticed a box marked "Danger H.T. 2200 V" at a substation in the main street. They did not understand the utility of a such a high voltage, while they argued, the supply was only 220 V. They asked their teacher this question the next day. The teacher thought it to be an important question and therefore explained to the whole class.
Answer the following questions:
(i) What device is used to bring the high voltage down to low voltage of a.c. current and what is the principle of its working ?
(ii) Is it possible to use this device for bringing down the high dc voltage to the low voltage? Explain
(iii) Write the values displayed by the students and the teacher.
How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of the coil in them?
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