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STD 12 - 14. Semicondutor electronics — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 14. Semicondutor electronics4 Marks
Question
A common transistor radio set requires $12\,V (D.C.)$ for its operation. The $D.C.$ source is constructed by using a transformer and a rectifier circuit, which are operated at $220\, V$ $(A.C.)$ on standard domestic $A.C.$ supply. The number of turns of secondary coil are $24,$ then the number of turns of primary are
✓

Answer

c
$\frac{ N _{ P }}{ N _{ S }}=\frac{ V _{ P }}{ V _{ S }}$

$\frac{ N _{ P }}{24}=\frac{220}{12}$

$N _{ P }=\frac{220 \times 24}{12}$

$N _{ P }=440$

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