JEE PYQ: Electromagnetic Induction Question 3
Question 3 - 2021 (24 Feb Shift 1)
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 ____.
Show Answer
Answer: 440
Solution
For a transformer, $\frac{N_p}{N_s} = \frac{V_p}{V_s}$. So $N_p = \frac{V_p \times N_s}{V_s} = \frac{220 \times 24}{12} = 440$.
BETA
