Q184 / 200 · Manipal (MET) 2010 · Physics

The number of turns in primary coil of a transformer is 20 and the number of turns in the secondary is 10 . If the voltage across the primary is 220 V , what is the voltage across the secondary?

Correct answer
A
110 V
B
130 V
C
190 V
D
310 V

Solution

Given, $N_P=20, N_S=10, e_P=220 \mathrm{~V}$ $\therefore$ Transformation ratio, $k$ $\frac{e_S}{e_P}=\frac{N_S}{N_P}$ or$\quad e_S=\frac{N_S}{N_P} \times e_P$ $=\frac{10}{20} \times 220=110 \mathrm{~V}$

Hence, the correct answer is option: 'A'.

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