Question

Primary side of a transformer is connected to 230 V, 50 Hz supply. Turns ratio of primary to secondary winding is 10 : 1. Load resistance connected to secondary side is 46 $\Omega$. The power consumed in it is :

• A. 12.5 W
• B. 10.0 W
• C. 11.5 W
• D. 12.0 W

Answer 1

Answer: (C)

11.5 W

Answer 2

Given:

$\frac{V_1}{V_2} = \frac{N_1}{N_2} = 10 \implies V_2 = \frac{230}{10} = 23 \, \text{V}.$

Power consumed:

$P = \frac{V_2^2}{R} = \frac{23 \times 23}{46} = 11.5 \, \text{W}.$

The Correct answer is: 11.5 W