An transformer is employed to reduce $220\ V$ to $11\ V$. The primary draws a current of $5\ A$ and the secondary $90\ A$. The efficiency of the transformer is

Question

Dr. Abubacker · Accepted Answer

(d) $\eta = \frac{V_{s}i_{s}}{V_{p}i_{p}} 	imes 100 = \frac{11 	imes 90}{220 	imes 5} 	imes 100 = 90\ \%$

Q. An transformer is employed to reduce $220\ V$ to $11\ V$. The primary draws a current of $5\ A$ and the secondary $90\ A$. The efficiency of the transformer is

Explanation

Reviewed by Dr. Abubacker

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