alleryA step-down transformer with 1000 primary turns and 100 secondary turns connected to 220 V a.c. gives an output of
A22 V
B2200 V
C200 V only
D110 V only
Answer & Solution
Correct answer: A. 22 V
1. Use V_s / V_p = N_s / N_p.
2. V_s = 220 * (100/1000).
3. = 220 * 0.1 = 22 V.
4. So the secondary voltage is 22 V.
_Source: Selina Concise Physics Class 10, Ch 10 Electromagnetism (Mistral OCR'd PDF), section on transformer numerical_
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