The primary winding of a transformer has 400 turns and its secondary has 100 turns.
PHYSICS
JAMB 1995
The primary winding of a transformer has 400 turns and its secondary has 100 turns. If a source of e.m.f. of 12V is applied to the primary, the secondary e.m.f. will be
- A. 3V
- B. 6V
- C. 24V
- D. 48V
Correct Answer: A. 3V
Explanation
\(\frac{V_s}{V_p}\) = \(\frac{N_s}{N_p}\) = \(\frac{I_p}{I_s}\)
\(\frac{100}{400}\) = \(\frac{V_S}{12}\)
V = 3V
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